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Q.

Is it true that when a glass rod is rubbed with a silk cloth, it acquires a positive charge?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Silk is rubbed on a glass rod, and as a result of the charge caused by the rubbing, both become electrified. Due to the movement of electrons from one body to another, one body obtains a negative charge and the other a positive charge. Since silk is more capable of drawing electrons than glass, it has a higher electron affinity. Silk therefore picks up a tiny bit of negative charge, whereas glass picks up a tiny bit of positive charge..
 
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