Two point charges +q and -q are held fixed at (-d, 0) and (d, 0) respectively of a (x, y) coordinate system

Q:Two point charges +q and -q are held fixed at (-d, 0) and (d, 0) respectively of a (x, y) coordinate system, then
(A)the electric field at all points on the x-axis has the same direction.
(B) E at all points on the Y-axis is along î.
(C)No Work has to be done in bringing a test charge from infinity to the origin.
(D)the dipole moment is 2qd directed along î.

Solution : E at all points on the y-axis is along . Electric potential at origin is zero so no work is done in bringing a test charge from infinity to origin.
 Hence (C) is correct.

Author: Rajesh Jha

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