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Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart. |
Answer» Solution :The middle POINT of the line joining two like charges is a NULL point. If we displace a TEST charge slightly along the line, the restoring FORCE try to bring the test charge back to the centre. If we displace the test charge normal to the line, the net force on the test charge takes it further away from the null point. Hence, the equilibrium is not stable. 
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