# AP (Advanced Placement) Physics(B-C): Questions 68 - 71 of 920

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## Question number: 68

MCQ▾

### Question

If a dipole is placed in uniform electric field and is the angle between dipole moment and uniform electric field, then at which of following value of , the torque on dipole becomes zero?

### Choices

Choice (5) Response

a.

b.

c.

d.

e.

None of the above

## Question number: 69

MCQ▾

### Question

As Earth rotates, the speed of a location on its equator is approximately miles per hour. At what latitude would a location have half that speed?

### Choices

Choice (5) Response

a.

b.

c.

d.

e.

All of the above

## Question number: 70

MCQ▾

### Question

Assuming negligible internal resistance in a battery, what is the change in electric potential energy when of charge is transferred between the terminals of the battery?

### Choices

Choice (5) Response

a.

b.

c.

d.

e.

None of the above

## Question number: 71

MCQ▾

### Question

A metal washer is placed on a turntable so that it just stays in place when the turntable is spinning. At this position, the washer is 10 cm from the center and is moving at constant speed. When the washer is positioned farther from the center, it slides off when the turntable is turned on. If the turntable always moves at the same speed, what must be done to allow the washer to stay in place when it is moved to 12 cm from the center?

### Choices

Choice (5) Response

a.

There are no changes that can be made under these conditions that would allow the washer to move in a stable circle at a distance greater than 10 cm.

b.

Glue another washer on top of the first washer.

c.

Scratch the bottom of the washer so that it has a rougher surface but same mass.

d.

Cut the top of the washer so that it has the same surface on the bottom but has less mass.

e.

None of the above

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