Point charges + 4q,, - q and + 4q are kept on x - axis at points x = 0,,x = a and x = 2a respectivel

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1. Electric Charges and Fields

easy

Point charges $ + 4q,\, - q$ and $ + 4q$ are kept on the $x - $axis at points $x = 0,\,x = a$ and $x = 2a$ respectively, then

A

Only $q$ is in stable equilibrium

B

None of the charges are in equilibrium

C

All the charges are in unstable equilibrium

D

All the charges are in stable equilibrium

(AIPMT-1988)

Solution

Force on each charge is zero. But if any of the charge is displaced, the net force starts acting on all of them.

Standard 12

Physics

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