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

Question

4. 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?

1)Before they touch they repel, after they touch they attract, 2)Before they touch they attract, after they touch they have no effect on each other ,3)Before they touch they repel, after they touch they have no effect on each other, 4)Before they touch they have no effect on each other, after they touch they repel, 5)Before they touch they have no effect on each other, after they touch they have no effect on each other, 6)Before they touch they attract, after they touch they repel, 7)Before they touch they have no effect on each other, after they touch they attract, 8)Before they touch they attract, after they touch they attract, 9)Before they touch they repel, after they touch they repel

b) After this experiment,

1)A is positive, B is neutral, 2)A is neutral, B is negative ,3)A is negative, B is neutral, 4)A is neutral, B is neutral, 5)A is positive, B is negative, 6)A is positive, B is positive, 7) A is negative, B is negative, 8)A is neutral, B is positive, 9)A is negative, B is positive

Explanation / Answer

here,

Since they are touched therefore some -ve charge from pithball A is transferred uniformly to Pithball B.

Part A :

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

Since both have same - charge on surface.

Part B:
After Experiment,
A remain neagtive since B was neutral
B become negative Since A was Negative

option 7 is correct

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