The separation between the plates is now increased to 4.40 mmmm . How much energy is stored in the capacitor now
Answers
Therefore, the energy stored in the capacitor is 2.95 × 10⁻¹¹ joules (J).
The separation between the plates of a capacitor is increased to 4.40 mm. How much energy is stored in the capacitor now?
A capacitor is an electrical device that stores electric charges. The energy stored in a capacitor can be determined by the formula
E = (1/2) × C × V²
where E is the energy stored, C is the capacitance, and V is the voltage across the capacitor.
Let us assume that the capacitance of the capacitor in question remains constant as its separation is increased.
Therefore, the voltage across the capacitor will decrease due to the increase in separation between its plates, as shown by the formula
V = Q/C
where V is the voltage, Q is the charge on the capacitor, and C is the capacitance.
The amount of charge on the capacitor remains constant, since no external factors affect the charge on the capacitor.
Thus, the decrease in voltage across the capacitor can be calculated using the formula
V₁/V₂ = d₂/d₁
where V₁ is the initial voltage, V₂ is the final voltage, d₁ is the initial separation, and d₂ is the final separation.
Therefore,
V₂ = V₁ × d₂/d₁
Substituting the values of V₁, d₁, and d₂, we get
V₂ = (1.5 × 10⁻⁶ C)/(8.85 × 10⁻¹² F × 3.2 mm) × 4.4 mm
V2 = 0.777 V
Therefore, the energy stored in the capacitor can be calculated using the formula
E = (1/2) × C × V²
Substituting the values of C and V, we get
E = (1/2) × 8.85 × 10⁻¹² F × (0.777 V)²
E = 2.95 × 10⁻¹¹ J
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Related Questions
A 2.5 newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 4.0 seconds?
Answers
Answer:
Explanation:
L = g·t² / 2 = 9.8·4.0² / 2 = 78.4 m
(I) Express the following angles in radians: (a) 30° , (b) 57°, (c)90°, (d) 360°, and (e)420°. Give as numerical values and as fractions of π
Answers
a) 30° = π/6 radian.
b) 57°= 0.32π radian.
c) 90° = π/2 radian.
d) 360° = 2π radian.
e) 420°= 7π/3 radian.
What is angle?When two straight lines or rays intersect at a single endpoint, an angle is created. The vertex of an angle is the location where two points come together. The Latin word "angulus," which means "corner," is where the term "angle" originates.
Relationship between degree and radian is:
1° = π/180 radian.
So, a) 30° = 30π/180 radian = π/6 radian.
b) 57° = 57π/180 radian = 0.32π radian.
c) 90° = 90π/180 radian = π/2 radian.
d) 360° = 360π/180 radian = 2π radian.
e) 420° = 420π/180 radian = 7π/3 radian.
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A charged particle is placed in an external magnetic field and it is moving in a circular path of radius 26m.The magnetic force acting on the particle is 16N.What is the kinetic energy of the particle
Answers
Answer:
208 Joules
Explanation:
The radius of the circular path the charge moves, r = 26 m
The magnetic force acting on the charge particle, F = 16 N
Centripetal force, \(F_c\) = m·v²/r
Kinetic energy, K.E. = (1/2)·m·v²
Where;
m = The mass of the charged particle
v = The velocity of the charged particle
r = The radius of the path of the charged particle
Whereby the magnetic force acting on the charge particle = The centripetal force, we have;
F = \(F_c\) = m·v²/r = 16 N
(1/2) × r × \(F_c\) = (1/2) × r × m·v²/r = (1/2)·m·v² = K.E.
∴ (1/2) × r × \(F_c\) = (1/2) × 26 m × 16 N = = (1/2)·m·v² = K.E.
∴ 208 Joules = K.E.
The kinetic energy of an particle moving in the circular path, K.E. = 208 Joules.
what is the maximum value of the electric field in an electromagnetic wave whose average intensity is 7.15 w/m2 ?
Answers
The electromagnetic wave's electric field can have a maximum value of 51.38 V/m.
Formulae of solving the question is:
Intensity of electromagnetic wave, I= ηcεο |E|^2 /2
In terms of science, electromagnetic radiation (EMR) is made up of electromagnetic (EM) field waves that travel over space while carrying radiant electromagnetic energy. It consists of X-rays, gamma rays, microwaves, infrared, visible light, ultraviolet, and radio waves. These waves are all a component of the electromagnetic spectrum.
Electromagnetic waves, which are synchronized oscillations of the electric and magnetic fields, are the traditional form of electromagnetic radiation. Due to the periodic alteration of the electric or magnetic field, electromagnetic waves are produced. Different wavelengths of the electromagnetic spectrum are created depending on the manner in which this periodic change takes place and the power generated. Electromagnetic waves move at the speed of light, typically abbreviated as c, in a vacuum. The oscillations of the two fields are perpendicular to one another in homogeneous, isotropic media.
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Find the net force acting on a box that has a force of 50 newtons pulling at an angle of 30 degrees and a force of 90 newtons pulling at a 160 degree angle
Answers
Answer:
Approximately \(69\; {\rm N}\) at approximately \(126^{\circ}\).
Explanation:
Assume that both angles in the question are relative to the positive \(x\)-axis (towards the positive horizontal direction.)
Horizontal component (\(x\)-component) of the two forces would be:
\((50\; {\rm N}) \, \cos(30^{\circ}) = \left(25\, \sqrt{3}\right)\; {\rm N} \approx 43.3\; {\rm N}\).\((90\; {\rm N}) \, \cos(160^{\circ}) \approx (-84.6) \; {\rm N}\).Note that the \(x\)-component of the \(90\; {\rm N}\) force is negative since this components points away from the positive \(x\!\)-direction.
Hence, the net force in the \(x\)-component would be:
\((50\; {\rm N}) \, \cos(30^{\circ}) + (90\; {\rm N}) \, \cos(160^{\circ}) \approx (-41.3) \; {\rm N}\).
(Again, this component is negative since it points away from the positive \(x\)-axis.)
Similarly, the vertical component (\(y\)-component) of the two forces would be:
\((50\; {\rm N}) \, \sin(30^{\circ}) = 25\; {\rm N}\).\((90\; {\rm N}) \, \sin(160^{\circ}) \approx 30.8 \; {\rm N}\).Hence, the net force in the \(y\)-component would be:
\((50\; {\rm N}) \, \sin(30^{\circ}) + (90\; {\rm N}) \, \sin(160^{\circ}) \approx 55.8\; {\rm N}\).
Refer to the diagram attached. The resultant net force is the vector sum of the components. Apply the Pythagorean Theorem to find this net force:
\(\begin{aligned}(\text{net force}) &= \sqrt{(\text{$x$-component})^{2} + (\text{$y$-component})^{2}} \\ &\approx \sqrt{(-41.3)^{2} + (55.8)^{2})}\; {\rm N} \\ &\approx 69\; {\rm N}\end{aligned}\).
Find the angle of this net force relative to the positive \(x\)-axis using the inverse cosine function \(\arccos\):
\(\begin{aligned}\arccos\left(\frac{(\text{$y$-component})}{(\text{net force})}\right) &\approx \arccos\left(\frac{55.8\; {\rm N}}{69\; {\rm N}}\right) \\ &\approx 126^{\circ}\end{aligned}\).
(The units might need to be converted into degrees.)
Two like charges are either both ______ or both _______
Answers
Answer:
negative or posotive i think
Explanation:
PLEASE HELP :/
george walks to a friend's house. he walks 750 meters north, then realizes he walked too far he turns and walks 250 meters south. the entire walk takes him 50 seconds whats his distance and displacement?
Answers
As U asked this question twice sry not twice 4 times.. I have been answered the question..Just look there..
TqWhat does a larger interquartile range mean.
Answers
Larger values indicate that the central portion of your data spread out further.
Summarize the differences between solids, liquids, and gases in terms of particle motion, shape, and compressibility.
Answers
Solids have a distinct volume and form. Although they have a specific capacity, liquids adopt the form of a container. Gases lack a distinct volume or form.
What is gas?Gas is a sample of matter that adopts the shape of the container in which it is housed and develops a uniform density inside the container.
a)Particle motion
Liquid molecules are more energetic than solid molecules. Further heating will cause the molecules to move so quickly that they won't stick together at all. The gas molecules have the highest energy content.
b)Shapes
Solids are discrete in their shape and volume. Although they take on the shape of the container, liquids have a specific volume. The form and volume of gases are ambiguous.
c)Compressibility
The solid or liquid's constituent atoms, ions, or molecules are in close proximity to one another.
The greater compressible nature of gases compared to liquids or solids is explained by the kinetic-molecular hypothesis.
Hence solids, liquids, and gases differentiate in terms of particle motion, shape, and compressibility.
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Answer:
In a solid, atoms vibrate or wiggle, but are locked in place. Solids have a rigid shape, and are hard to compress. In a liquid, atoms have some freedom to move. Liquids take the shape of their container, and are hard to compress. In a gas, atoms move freely. Gases have no definite shape, and are easy to compress.
Explanation:
Object a and b are both in motion when they collide with eachother. They then continue in a new direction unaffected by any other forces. This is a
Answers
Object a and b are both in motion when they collide with eachother. They then continue in a new direction unaffected by any other forces. This is an elastic collision.
What is collision?A collision refers to an event in which two or more objects come into contact with each other, resulting in a physical interaction.
In an elastic collision, the total kinetic energy of the system is conserved before and after the collision, and the objects involved rebound off each other without any loss of energy due to deformation or heat generation.
During the collision, object A and object B exchange momentum and energy. If the collision is elastic, the total kinetic energy of the system remains the same, although it may be redistributed between the objects.
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In AC Theory, we are going to add components that will cause use to rely on Trigonometry to evaluate different types of Electrical Power. What three units of power will we be measuring
Answers
Answer:

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Home / AC Circuits / Power in AC Circuits

Power in AC Circuits
Electrical power consumed by a resistance in an AC circuit is different to the power consumed by a reactance as reactances do not dissipate energy
  
In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, for AC circuits with reactive components we have to calculate the consumed power differently.
Electrical power is the “rate” at which energy is being consumed in a circuit and as such all electrical and electronic components and devices have a limit to the amount of electrical power that they can safely handle. For example, a 1/4 watt resistor or a 20 watt amplifier.
Electrical power can be time-varying either as a DC quantity or as an AC quantity. The amount of power in a circuit at any instant of time is called the instantaneous power and is given by the well-known relationship of power equals volts times amps (P = V*I). So one watt (which is the rate of expending energy at one joule per second) will be equal to the volt-ampere product of one volt times one ampere.
Then the power absorbed or supplied by a circuit element is the product of the voltage, V across the element, and the current, I flowing through it. So if we had a DC circuit with a resistance of “R” ohms, the power dissipated by the resistor in watts is given by any of the following generalised formulas:
Classify statements about total internal reflection true or fal False Answer Bank When light hits a boundary at less than the critical angle, it will undergo total internal reflection Simple reflection of light off a silvered mirror is more efficient than total internal reflection, so mirrors are often used instead of prisms in optical instruments to minimize light loss. A smaller critical angle means that total internal reflection is more likely to occur. Piber optic cables are a practical application of the phenomenon of total internal reflection.
Answers
In the field of physics, total internal reflection refers to the entire reflection of a beam of light that is traveling through a medium such as water or glass back into the medium itself from the surfaces that surround the medium.
When the angle of incidence is larger than a specific limiting angle, which is referred to as the critical angle, the phenomena will take place. When a ray of light traveling through a medium with a higher index of refraction approaches another medium with an angle of incidence that is greater than the critical angle, a phenomenon known as total internal reflection occurs. In general, this phenomenon takes place at the boundary between two transparent media.
True statements are;
1. A smaller critical angle means the total internal reflection is more likely to occur.
2. Fiber optic cables are practical applications of total internal reflections.
False statements are;
1. When light hits a boundary at a less than the critical angle, it will undergo total internal reflection.
2. Single reflection of light of a silvered mirror is more efficient than total internal reflection so mirrors are often used instead of prisms in optical instruments to minimize light loss.
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Describe the relationship between current, voltage difference and resistance in a circuit.
Answers
Answer:
see below
Explanation:
voltage = current * resistance
which is larger 15mm or 0.15cm
Answers
Answer:
1 cm = 10mm
Explanation:
hey there both are equal
Which of the following is not an example of work?
1.a man pushing a heavy box across the floor
2.an air hockey puck traveling at a constant speed
3.a magnet repelling a 4.compass needle
ship movement that causes ripples in the water
Answers
Answer:
3 a is the ans i think so ....
A student measures the mass and volume of a sample of aluminum at room temperature, and calculates the density of al to be 2. 85 grams per cubic centimeter. Based on table s, what is the percent error for the student's calculated density of al?.
Answers
The percent error for the student's calculated density of Al during the experiment is 5,56%
The accepted value of the density of aluminum is 2.7 g/cm3.
To calculate the percent error of the student's calculated density of aluminum, one must use the equation:
Percent Error = [Accepted Value - Measured Value] / Accepted Value × 100.
In this case, the percent error is
[2.7 - 2.85]/2.7 ×100 = -5.56%.
This means that the student's measured value was 5.56% lower than the accepted value. This indicates that the student's measurement was slightly lower than the accepted value, but still within an acceptable margin of error
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You pull horizontally on a 50-kg crate with a force of 250 N and the friction force on the crate is 100 N. The acceleration of the crate is
Answers
Answer:
F = M a Newton's Second Law
(250 -100) N = 50 kg a
a = 150 N / 50 kg = 3 m/s^2
explain why at the atomic level, conductors move charge easily and insulators do not
Answers
Question at position 3
The table shows mass and weight data of some common items.
Based on the data, which conclusion is valid regarding the relationship between the force of gravity, mass, and weight?
The table shows mass and weight data of some common items.
Based on the data, which conclusion is valid regarding the relationship between the force of gravity, mass, and weight?
The weight of an object depends on the force of gravity of the planet, but the mass does not.
Neither the mass nor the weight of an object depends on the force of gravity.
The mass of an object depends on the force of gravity of the planet, but the weight does not.
Both the mass and the weight of an object depend on the force of gravity.
Answers
An increase in the distance between the objects causes a greater change in the gravitational force than the same increase in mass. It depends on the object's mass and acceleration due to gravity.
Mass is an intrinsic unchanging property. Weight is a force and it depends on gravitational force. This force is directly proportional to mass the more mass the object has the stronger the force of gravity will be. Because of this, it turns out that gravity does not matter when we compare the distance traveled by objects with different masses. The important part of the force is air resistance also called drag.
The slope of the graph is the relationship between weight and mass. The slope tells how many newtons of weight pull down on each kilogram of mass. Mass is the measure of the amount of matter in an object. This is an immutable property inherent in the body. Mass cannot be destroyed or created. Weight is the production of mass and acceleration due to gravity.
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Suppose Alex is navigating using a compass. She starts walking at an angle of 60° north of east and walks a total of 100 m. How far north is she from the starting point? How far east?
Answers
Answer:
\(50\:\mathrm{m\: North}\\50\sqrt{3}\:\mathrm{m\: East}\)
Explanation:
We can create a 30-60-90 triangle. The distance she walked is then the hypotenuse of the triangle, and using 30-60-90 triangle rules, we have the following:
The North leg is opposite to the \(30^{\circ}\) angle. Therefore, if we call this distance \(y_N\), we have the following:
\(\sin 30^{\circ}=\frac{y_N}{100},\\\frac{1}{2}=\frac{y_N}{100},\\y_N=\fbox{$50\:\mathrm{m}$}\).
The East leg is opposite to the \(60^{\circ}\\\) angle. If we call this distance \(x_E\), we have:
\(\sin 60^{\circ}=\frac{x_E}{100},\\\frac{\sqrt{3}}{2}=\frac{x_E}{100},\\x_E=\fbox{$50\sqrt{3}\:\mathrm{m}$}\).
In an attempt to deliver a parcel on time,the dispatch rider had to ride 10 kilometers 15 degrees south east ,he then rode 11 kilometers 30 degrees north east and then takes a shortcut at 22 kilometers Find the rider's displacement
Answers
Answer:
D = 4.05 km
Explanation:
In this case, it's really neccesary to analyze the given data.
First, the rider goes 10 km SE 15°. Then 11 km 30° to the NE direction. Then, he dispatch the order, and then, takes a shorcut to get back at 22 km heading W (This is the missing data of your exercise).
According to all these data, we have the magnitude of the displacement in each part of the travel, but to know the displacement we need to know the x and y components of these magnitudes, so we can really know the total displacement of the rider.
Let's cut this by parts. Part A would be the 10 km SE, Part B 11 km 30° NE and finally Part C would be the remaining 22 km
Part A:
in this case, is heading south east, so it's going in the x-axis positive but y-axis negative so:
Dxa = 10 cos15° = 9.659 km
Dya = 10 sin15° = 2.588 km (But as we are heading south is negative) = -2.588 km
Part B:
Heading NE, it's positive in the x-axis and y-axis so:
Dxb = 11 cos30° = 9.526 km
Dyb = 11 sin30° = 5.5 km
Part C:
Finally in this part is heading west, which means is heading in the x-axis negative, and it does not have a y component so:
Dxc = Dc = -22 km
Now that we have the displacement for each part and it's components, let's calculate the displacement in X and Y:
Dx = 9.659 + 9.526 - 22 = -2.815 km
Dy = -2.588 + 5.5 = 2.912 km
To calculate the magnitude of the displacement:
D = √Dx² + Dy²
D = √(-2.815)² + (2.912)²
D = 4.05 kmHope this helps
A cross-country skier can complete a 7. 5 km race in 45 min. What is the skier’s average speed? km/h.
Answers
The average speed is a scalar quantity. The average speed of the skier is 10 km/hrs.
What is the average speed?
It is calculated by dividing the total distance by the total time elapsed.
The
\(\overline{v}={\frac{\Delta x}{\Delta t}}\)
Where,
\(\overline{v}\) = average velocity
\({\Delta x}\) = displacement = 7.5 km
\({\Delta t}\) = change in time = 45 min = 0.75 hours
Put the values in the formula,
\(\overline{v}={\frac{7.5 }{0.75 }}\\\\\overline{v}= 10 \rm \ km/hrs\)
Therefore, the average speed of the skier is 10 km/hrs.
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a weightless spring scale is attached to two equal weights as shown below. the reading on the scale will be
Answers
When a weightless spring scale is attached to two equal weights, the reading on the scale will be zero. This is because the weights on both sides are balanced, resulting in no net force acting on the scale.
The reason for this is Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this case, when one weight exerts a downward force on the spring scale, the other weight exerts an upward force of the same magnitude on the scale.
These opposing forces cancel each other out, resulting in a net force of zero. As a result, the spring scale does not experience any deformation and the reading remains at zero.
It is important to note that this only applies when the two weights are equal. If the weights were different, there would be an imbalance in the forces, causing the spring scale to register a non-zero reading.
In summary, when a weightless spring scale is attached to two equal weights, the reading on the scale will be zero due to the balanced forces acting on it.
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The conservation of mass also applies to physical changes. A student decides to make ice pops by placing some cola in a plastic cup into the freezer. If the student freezes 20 grams of cola, what will the mass of the student's cola pop be once it is frozen?
Answers
According to the law of conservation of mass, if a student makes 20 grams cola and freezes it the mass of the cola will remain same as mass is neither created nor destroyed.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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in a mechanical wave, the restoring force is the force that actually causes the oscillation.a. opposite the direction of the propagationb. opposite the direction of the dicplacement from equilibriumc. in the same direction as the dicplacement from equilibriumd. in the same direction as the propagaion
Answers
Option B; In a mechanical wave, the restoring force is the force that actually causes the oscillation opposite the direction of the displacement from equilibrium.
Oscillation is the repeating or periodic oscillation of a quantity, often in time, around a central value (often an equilibrium point) or between two or more states. A swinging pendulum and alternating current are two common examples of oscillation. Physics can employ oscillations to simulate intricate interactions, as those between atoms.
The beating of the human heart (for circulation), business cycles in economics, predator-prey population cycles in ecology, geothermal geysers in geology, the vibration of the strings in guitars and other string instruments, the periodic firing of nerve cells in the brain, and the periodic swelling of Cepheid variable stars in astronomy are just a few examples of the dynamic systems that exhibit oscillations in nearly every branch of science.
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The modern standard of length is 1 m and the speed of light is approximately 2.99792 x 10^8 m/s. Find the time change in t for light to cover 1 m at the given speed.
Answers
Explanation:
Distance = rate × time
1 m = (2.99792×10⁸ m/s) t
t = 3.33565×10⁻⁹ s
Light is the fastest thing in the universe. The speed of light is 2.99792 x 10⁸ m/s . The time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
What is speed?Speed is a physical quantity that means the distance in meter covered by a moving body in one second. The speed of light is 2.99792 x 10⁸ m/s. Light from sun only takes 8 min to travel to the earth surface.
The speed of a moving particle or wave is mathematically the ratio of distance and time. Thus time of travel can be found out from the distance and speed.
It is given that the distance travelled by light is 1 m and its speed is 2.99792 x 10⁸ m/s. Thus the time taken to travel is calculated as follows:
Time = distance/speed
= 1 m/ (2.99792 x 10⁸ m/s)
= 3.39 x 10⁻⁹s
Therefore, the time that light takes to cover a distance of 1 meter is just 3.39 x 10⁻⁹seconds.
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How might error analysis help scientists identify and quantify the
causes and effects of uncertainties in measured data? Why is it
important to perform multiple trials in an experiment?
Answers
Answer: For producing the error free results of an experiment that identification and quantification of effects of uncertainties are important.
Explanation:
The error analysis is necessary to detect the uncertainties in the measured data or results of the experiment to ensure the validity and acceptability of the results. The errors can be avoided by increasing the precision and accuracy of the measuring instruments. The other factors like changes in the variables of the experiment can also contribute to the errors in the experiment.
It is necessary to perform the multiple trails in an experiment to assure that the results of the experiment are consistent with every trial.
Where did the Big Bang occur?
A. First the fabric of space came into existence, and then the Big Bang appeared at some arbitrary point within it.
B. Everywhere in the universe at once, because the entire universe (including space itself) was a point
C. At all points simultaneously on the surface very much like an expanding balloon
D. at a single point in the center of the then-existing universe
E. All of these statements are equally correct.
Answers
The Big Bang occurred in B. Everywhere in the universe at once, because the entire universe (including space itself) was a point
A theory called the Big Bang Theory aims to explain how the vast world got its start. It was brought to a conclusion using several formulae. The Big Bang happening simultaneously everywhere in the cosmos is currently the most frequently accepted idea. This is due to the theory that there was no one place at which the Big Bang happened since the cosmos at time of the Big Bang is thought to have been infinitely tiny and dense.
The Big Bang, according to this theory, was not an explosion that occurred at a single site but rather the abrupt expansion of the cosmos from a very tiny and dense state. The idea holds that the whole universe including space itself was a point.
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PLEASEEE HELP!!!!! I HAVE BEEN STRUGGLING FOR 2 DAYS
If i workout 90 minutes on earth, if I am on a rocket traveling 0.80c, according to the timer on the rocket, how long should I exercise?
Answers
Answer:
You should still workout 90 min.
The proper time is measured by a single clock in a single place.
The proper time on earth is 90 min.
The clock on the rocket is also in a single place in the frame of the rocket so you still need to workout for 90 min.
Which if the following activities would a physician most likely recommend to a 52-year-old patient recovering from a stroke?
running
basketball
ai chi
tennis
Answers
The following activities would a physician most likely recommend to a 52-year-old patient recovering from a stroke is c. Ai Chi
Ai Chi is a low-impact exercise that involves slow, gentle movements performed in a warm water pool. This type of exercise is ideal for stroke patients as it helps improve their range of motion, balance, coordination, and overall physical strength. Unlike running, basketball, or tennis, which are high-impact activities that may cause additional strain on the patient's body, Ai Chi provides a low-risk, safe way for stroke patients to engage in physical activity.
Moreover, the warm water used in Ai Chi can also provide therapeutic benefits, such as improving circulation, reducing muscle tension, and promoting relaxation, which can further aid in the patient's recovery process. Therefore, a physician would most likely recommend Ai Chi as an ideal activity for a 52-year-old patient recovering from a stroke. So the correct answer is c. Ai Chi.
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