Four charges equal to -Q are placed at the four corners of a square and a charge q is at its centre If the system is in equilibrium the value of q is
As we learnt in
Superposition of Electric field -
The resultant electric field at any point is equal to the vector sum of all the electric fields.
Consider the four forces F1, F2, F3 and F4 acting on charge (-Q) placed at A
For equilibrium, consider forces along DA and equate the resultant to zero
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