You know that a cetrain electroscope is charged because thefoil extends when the

Question

You know that a cetrain electroscope is charged because thefoil extends when there is nothing near to influence it. when aballoon rubbed with fur is brought near (but not near to change thenet charge on the electroscope), the gold foil is seen to moveslightly downward. Is the change on the electroscope + or -? Pleaseexplain by only using words and not diagrams. Ok, I think the charge is negative, but I don't know how toexplain it more in detail please explain. You know that a cetrain electroscope is charged because thefoil extends when there is nothing near to influence it. when aballoon rubbed with fur is brought near (but not near to change thenet charge on the electroscope), the gold foil is seen to moveslightly downward. Is the change on the electroscope + or -? Pleaseexplain by only using words and not diagrams. Ok, I think the charge is negative, but I don't know how toexplain it more in detail please explain.

Explanation / Answer

When you rub a balloon with fur, the balloon becomesnegatively charged in the region where you rubbed it (it takeselectrons from the fur). The negatively charged balloon isthen brought close to the electroscope, which induces a positivecharge in the top of the electroscope. This means thatelectrons left the top and went to the foil in the bottom. Ifadding electrons to the foil made it come closer together, theelectroscope must have been positively charged to begin with. Does this make sense/help?

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