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Q.

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.

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a

E4

b

3E4

c

5E4

d

7E4

answer is D.

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Detailed Solution

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