Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is

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Zero

Along the diagonal AC

Along the diagonal BD

Perpendicular to side AB

answer is C.

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Detailed Solution

We put a unit positive charge at O. Resultant force due to the charge placed at A and C is zero and resultant charge due to B and D is towards D along the diagonal BD.

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