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Questions  

The angle θ such that the electric field (vector) at A is perpendicular to dipole moment (vector) is

a
0o
b
90o
c
tan−1⁡2
d
tan−1⁡2

detailed solution

Correct option is D

tan⁡α=EθEr=12tan⁡θθ+α=π2⇒tan⁡θ=2

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