Question

A dipole of dipole moment p is kept at the centre of a ring of radius r and charge q. The dipole moment has direction along the axis of the ring. The resultant force on the ring due to the dipole is

Answer 1

The resultant force on the ring due to the dipole is kp Q/R^3.

Explanation:

• Electric field at each is opposite to the direction of the dipole moment.
• Electric field at each point on the surface of ring due to the dipole is
• E=kp/ R^3

Now net force on ring is F= QE

                                           = kp Q/R^3

Hence the resultant force on the ring due to the dipole is kp Q/R^3.

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Answer 2

resultant force on ring due to dipole KPQ/R^3