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Q.

A table tennis ball which has been covered with conducting paint is suspended by a silk thread so that it hang between two plates, out of which one is earthed and other is connected to a high voltage generator. This ball 

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a

Is attracted towards high voltage plate and stays there 

b

Hangs without moving 

c

Swing backward and forward hitting each plate in turn 

d

Is attracted to earthed plate and stays there

answer is C.

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Detailed Solution

Firstly being a conductor it is attracted by the high voltage plate, when charge is shared, ball is repelled until it goes to other plate and whole of the charge is transferred to the earth and the process is repeated.

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A table tennis ball which has been covered with conducting paint is suspended by a silk thread so that it hang between two plates, out of which one is earthed and other is connected to a high voltage generator. This ball