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Question

# The electric field due to an electric dipole at a distance r from its center in axial position is E. If the dipole is rotated through an angle of 90o about its perpendicular axis, the electric field at the same point will be

A
E
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B
E4
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C
E2
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D
2E
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Solution

## The correct option is B E2When a dipole AB of very small length is taken, then for a point P located at an axial distance r from the axis the electric field is given byE=14πε02Pr3 ...(i)When dipole is rotated by 90o, then electric field is given byE′=14πε0Pr3 ...(ii)From Eqs. (i) and (ii), we getE′=E2

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