AP Physics 1 Question 269: Answer and Explanation

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Question: 269

5. A sphere of charge +Q is fixed in position. A smaller sphere of charge +q is placed near the larger sphere and released from rest. The small sphere will move away from the large sphere with

  • A. decreasing velocity and decreasing acceleration
  • B. decreasing velocity and increasing acceleration
  • C. increasing velocity and decreasing acceleration
  • D. increasing velocity and increasing acceleration

Correct Answer: C

Explanation:

C

The acceleration of the small sphere is

As r increases (that is, as the small sphere is pushed away), a decreases. However, since a is always positive, the small sphere's speed, v, is always increasing.