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Two charges 2 mu C and -2 muC are placed...

Two charges `2 mu C and -2 muC` are placed at points A and B 6 cmapart.
(a) Identify an equipotential surface of the system.
(b) What is the direction of the electric field at every point on this surface ?

Text Solution

Verified by Experts

(a) An equipotential surface is the surface, potential at all point of which is same and there is no potential gradient. For a dipole AB consisting of 2 charges of `+ 2muC`, a plane CD passing through the mid-point O of AB and perpendicular to axis AB (i.e., plane containing equatorial line of dipole) behaves as an equipotential surface because potential at all points of this line is zero.
(b) The direcction of electric field is always perpendicular to equipotential surface. Hence at any point P of equipotential surface electric field `vec E` is directed along axis of dipole from +ve cahrge towards -ve charge.
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