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Question

Charges q and +q located at A and B respectively, constitute an electric dipole. Distance AB=2a, O is the mid point of the dipole and OP is perpendicular to AB. A charge Q is placed at P where OP=y and y>>2a. The charge Q experiences an electrostatic force F. If Q is now moved along the equatorial line to P such that OP=(y3), the force on Q will be close to
Here (y3>>2a)



A
3F
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B
F3
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C
9F
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D
27F
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Solution

The correct option is D 27F
Electric field of equitorial line of dipole
=KPr3


At point P, F=+QKPy3
At point P1,F1=+QKP(y3)3=27F.

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