in experiment involving a pithball electroscope, what causes the pithball to move?

Question

is it A.the pithball always holds a natural positive charege,and it is attracted to yhe other charged object._B.electrons jump onto or off the nuetral ball when a charged object comes close to it, causing it to become charged_C.as soon as an object approches the pithball there is an immediated repulsion_D. the pithball does not become charged but it gets caught up between two other charged objects......please someone help me answer this hard question

Answer 1

I think you're referring to the attracted-then-repelled behavior of a pith ball when a charged object is brought toward it. Answer B best describes the cause of the resulting behavior. When the ball and the other object are touching or nearly so, the charge jumps between them and roughly equalizes the charge density, causing repulsion.