ElectrostaticsHard

Question

Four electric charge +q, +q, -q and -q are placed at the corner of a square of side 2 L (see figure). The electric potential at point A, midway between the two charge +q and +q, is
                 

Options

A.
B.
C.
D.zero

Solution


          
A is the midpoint of PS
∴ PA = AS = L
AR = AQ =
Electric potential at a point A due to the given charge configuration is

   
   

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