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Question

An electric dipole is placed at the origin and is directed along the x-axis. At a point P, far away from the dipole,the electric field is parallel to the y-axis. OP makes an angle θ with the x-axis. Then,

A
tanθ=3
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B
tanθ=2
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C
tanθ=1
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D
tanθ=12
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Solution

The correct option is A tanθ=2
As we Know
tanα=12tanθ
because
Ecosα=2βcosθ4π0r3
Esinα=βsinθ4π0r3

ortanα=12tanθ
θ+α=90orθ=90α
tanθ=cotα=1tanα=2tanθ
ortanθ=2

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