Single Choice

A piece of paper appears to be attracted to a charged ebonite rod, even before they touch (see fig.). The charge at B is :

Apositive
Bmay be positive or negative
Cno charge
Dnegative
Correct Answer

Solution

Electrostatic induction is a redistribution of electrical charge in an object, caused by the influence of nearby charges without even touching each other. In the presence of a charged body, an insulated conductor develops a positive charge on one end and a negative charge on the other end.
In this case, A piece of paper appears to be attracted to a charged ebonite rod, even before they touch is because of induction. In the figure it is given that the ebonite rod is negatively charged. The point A will be attracted only if the charge at that point is positive because only unlike charges attract each other. If the point A is positive, then point B should be negatively charged.
Hence, the charge at B is negative.

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