AP (Advanced Placement) Physics(B-C): Questions 253 - 254 of 921

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Question 253

Question

MCQ▾

A Capacitor is charged to . Without removing any of the charges or changing the plate՚s area or dielectric, the plates are moved apart so that there is twice the distance between them as before. What happens to the energy stored in the capacitor?

Choices

Choice (5)Response

a.

Negative work is done in moving the plates apart, so the energy stored in the capacitor decreases.

b.

The capacitance increases when the distance between plates increases, so the potential difference between the plates also increases and the energy in the capacitor increases.

c.

Positive work is done in moving the plates apart, so the energy stored in the capacitor increases.

d.

The capacitance decreases when the distance between the plates increases, so the energy stored in the capacitor decreases.

e.

Question does not provide sufficient data or is vague

Question 254

Question

MCQ▾

An object is dropped from a height of 10 m above the ground. What is the ratio of the kinetic energy of the object when it has fallen halfway to its kinetic energy just before it hits the ground?

Choices

Choice (5)Response

a.

b.

c.

d.

e.

Question does not provide sufficient data or is vague

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