Q. 173.6( 8 Votes )
Four equal charge
Let the force due to charge at corner B, C and D be FB, FC, FD.
Charge at each corner, .
The side of square is.
By Pythagoras theorem,
The length of diagonal .
By Coulomb’s law, the electric force is given by:
Where ϵ0 is the permittivity of free space
k is the electrostatic constant
q1 and q2 are the magnitude of charges
r is the distance of separation between the charges
Resolving FC , we get
The net force is:
We know that
Hence, the magnitude of net force is
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