Single Choice

When a glass rod is rubbed with silk, the charge acquired by the silk is :

Anegative
Correct Answer
Bpositive
Cpartly positive and partly negative
Dnone of these

Solution

When a glass rod is rubbed with silk and brought near a GLE, the leaves of the GLE appear to diverge further. When the glass rod touches the brass of the disc of the GLE, the free electrons from it flow to the glass rod. This causes a deficiency of electrons on the brass disc. To make up for this deficiency the electrons from the fold leaves flow towards the disc. This in turn causes electron deficiency on the gold leaves. As gold leaves as positively charged, they repel each other and hence diverge. Therefore the glass rod has a negative charge. Hence, the charge acquired by the silk is negative charge.

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