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Q.

A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to X-rays for a short period. Then

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a

The divergence of leaves will not be affected

b

The leaves will diverge further 

c

The leaves will collapse

d

The leaves will melt

answer is B.

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Detailed Solution

Charge on glass rod is positive, so charge on gold leaves will also be positive. Due to X-rays, more electrons from leaves will be emitted, so leaves becomes more positive and diverge further.

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