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(a) Derive the expression for the electr...

(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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