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Question

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

A
E2
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B
E
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C
2E
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D
E4
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Solution

## The correct option is A E2 Given, |−−→Eax|=E |−−→Eax|=2kpr3 and |−−→Eequ|=kpr3 After 90∘ rotation, the point lies on the equatorial line of the dipole. ∴ Eeq=Eax2=E2 <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (a) is the correct answer.

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