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  4. A table tennis ball which has been covered with a conducting paint is suspended by a silk thread so that it hangs between two metal plates. One plate is earthed. When the other plate is connected to a high voltage generator, the ball

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Q. A table tennis ball which has been covered with a conducting paint is suspended by a silk thread so that it hangs between two metal plates. One plate is earthed. When the other plate is connected to a high voltage generator, the ball

BHUBHU 2008Electric Charges and Fields

Solution:

When the other piate is connected to the high voltage generator, the negative charge induced on the ball cause attraction. When it strikes the $+ve$ plate charge distribution again takes piace. This causes repulsion. Hence, the ball swings backward and forward hitting each plate in tum.