First slide

Electrostatic force

Question

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

Easy

A

Zero
B

Along the diagonal AC
C

Along the diagonal BD
D

Perpendicular to side AB

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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