(a) Derive the expression for the electric potential at any point P, at distance r from the centre of an electric dipole, making angle alpha, with its axis. (b) Two point charges 4 mu C and + 1 mu C are separated by a distance of 2m in air. Find the point on the line joining charges at which the net electric field of the system is zero.
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Starting point is joining point on the line joining charges at which the net electric field of system is zero.
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