science

In experiments involving a pithball electroscope, what causes the pithball to move? I believe the answer is B

A. The pith material always holds a natural positive charge, and it is attracted to other charged objects.

B. Electrons jump onto or off the neutral ball when a charged object comes close to it, causing it to become charged.

C. As soon as an object approaches the pithball there is an immediate repulsion.

D. The pithball does not become charged but it gets caught up between two other charged objects.

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  1. You might begin here:

    http://www.google.com/search?q=experiments+with+a+pithball+electroscope&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

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