A pith ball is a small nonconducting ball covered with a uniform, conducting met

Question

A pith ball is a small nonconducting ball covered with a uniform, conducting metal foil. Initially pith ball A is charged negatively, pith ball B is neutral, and they small distance d apart. Now, the balls are brought together, touch, and then separated so they are again distance d apart.

a) Which is true of the forces between the two pith balls?

Before they touch they repel, after they touch they repelBefore they touch they have no effect on each other, after they touch they repel    Before they touch they repel, after they touch they have no effect on each otherBefore they touch they attract, after they touch they have no effect on each otherBefore they touch they repel, after they touch they attractBefore they touch they have no effect on each other, after they touch they attractBefore they touch they have no effect on each other, after they touch they have no effect on each otherBefore they touch they attract, after they touch they repelBefore they touch they attract, after they touch they attract

b) After this experiment,

A is neutral, B is negativeA is positive, B is positive    A is positive, B is negativeA is neutral, B is positiveA is positive, B is neutralA is negative, B is positiveA is neutral, B is neutralA is negative, B is neutral A is negative, B is negative

Explanation / Answer

Part A

Before they touch they have no effect on each other, after they touch they repel

before touch one ball is neutral and other have charge so there is no effect on each other. after touching them negative charge distribute on them and as they have same charge so they repel each other.

Part B

A is negative, B is negative

Both will have negative charge as they touched to each other charge redistribute on both the balls and net charge is negative.

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