.A square of side a has charge q at each of its corner.Calculate the i) electric potential and ii) electric field intensity due to these charges at the center of the square.

(ii) The electric field at the center of   the square will be 0 because the force at the center of the square due to all charges is 0.

(i) electric potential =(4*2^1/2)q*9*10^9/a    

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A square of side a has a charge + Q at each corner. What is the electric potential energy of this system of charges? Express your answer in terms of the variables a, Q and appropriate constants.
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