Published by:
CGP EDU Academic Team
Published on: August 21, 2026
Four points charges, each equal to 
are held at the corners of a square 
of side 
. The magnitude of a charge 
is placed at the centre of the square, so that the system of charges is in equilibrium, is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
As diagonal, 
Let us consider the equilibrium of charge 
at 
.
Force exerted on charge at 
by charge at 
,
Similarly, 
and
Net force on charge 
at 
in the 
-direction,
Similarly, net force on charge 
at 
in the 
-direction is
Resultant force on charge 
at 
,
Charge 
will be in equilibrium, if
i.e. if 
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