OK In Experiments Involving A Pith Ball Electroscope, What Cases The Pith Ball To Move?

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ray of light Profile
ray of light answered
When the pith balls are touching or when the electrons jump onto or off the neutral ball, the ball transfers small number of electrons with each swing and thus causing it to charge.
Anonymous Profile
Anonymous answered
A pith ball is suspended between a positively charged sphere B and earthed metal plate C. It is observed that the pith ball swings towards B,then to C and back to B again. After some time it stops. Why?

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