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A small electric dipole p=pi^ is placed at the origin and electric field at point at A (x,0) is found to be E. Now the dipole is rotated in anti clockwise in XY plane about Z- axis through an angle of 60⁰. Then electric field at the same point will be.

a
E4
b
3E4
c
5E4
d
7E4

detailed solution

Correct option is D

In the first case,E=K2px3⇒E2=k.px3In the second  case E1=k.px33 cos2 60o+1=7E4.

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