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Electric Energy Storage — Quiz Answers

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The plates on a vacuum capacitor have a radius of 2 point 5 millimeters and are separated by a distance of 0 point 7 5 millimeters What is the capacitance of this capacitor?

A
2 point 3 times 10 to the negative 13 power cap f
B
9 point 3 times 10 to the negative 11 power cap f
C
2 point 3 times 10 to the negative 10 power cap f
D
3 point 0 times 10 to the negative 11 power cap f
2
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The plates on a capacitor have a radius of 1 point 5 millimeters and are separated by a distance of 0 point 4 3 millimeters The space between the plates is filled with a dielectric that has a dielectric constant of 3 point 8 What is the capacitance of this capacitor?

A
5 point 5 times 10 to the negative 10 power cap f
B
5 point 5 times 10 to the negative 13 power cap f
C
1 point 4 times 10 to the negative 10 power cap f
D
1 point 4 times 10 to the negative 13 power cap f
3

Why are the plates in a capacitor parallel to each other?

A
to allow each plate to become positively charged
B
to allow each plate to hold the same amount of charge
C
to form a uniform electric field between the plates
D
to establish a potential difference between the plates
4

What is the amount of charge a capacitor can store per volt of potential difference?

A
electric potential energy
B
dielectric constant
C
capacitance
D
permittivity
5

A capacitor is connected to a power source and begins charging. What causes the capacitor to stop charging while it is still connected to the power source?

A
Electrons are too strongly repelled from the negatively charged plate.
B
No additional positive charges can be moved onto the second plate.
C
The charged plates attract each other and touch, causing a discharge.
D
The power source runs out of electrons to send to the charged plate.
6

What is the SI unit for capacitance?

A
ampere (A)
B
farad (F)
C
joule (J)
D
volt (V)
8

Rami uses a disposable camera that has a flash. When he wants to take a picture, he holds a button and hears a rising whining sound. When a small light glows, the flash is ready. He presses the shutter button, the flash lights up, and he takes his picture. Which statement best describes how a capacitor is useful in the camera?

A
It protects the circuits from a burst of energy by storing charge.
B
It stores energy and delivers it in a short burst.
C
It stores energy and delivers it in a steady current.
D
It protects the circuits from a steady current by storing charge.
9

How is capacitance related to the distance between the plates of a capacitor?

A
It is inversely proportional, so the capacitance decreases as the distance increases.
B
It is inversely proportional, so the capacitance increases as the distance increases.
C
It is directly proportional, so the capacitance decreases as the distance increases.
D
It is directly proportional, so the capacitance increases as the distance increases.
10

What is the measure of a specific material’s ability to insulate charges from each other?

A
capacitance
B
dielectric constant
C
potential difference
D
permittivity

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Electric Energy Storage — Quiz Answers — Physics