Two charges + q and -q are placed at a distance a in a uniform el

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201.

Two charges + q and -q are placed at a distance a in a uniform electric field. The dipole moment of the combination is 2qa cos θ i^ + sin θ j^, where, θ is the angle between the direction of the field and the line joining the two charges. Which of the following statement(s) is/are correct ?

  • The torque exerted by the field on the dipole vanishes

  • The net force on the dipole vanishes

  • The torque is independent of the choice of coordinates

  • The net force is independent of a


B.

The net force on the dipole vanishes

C.

The torque is independent of the choice of coordinates

D.

The net force is independent of a

The situation can be diagrammatically as,

             

The dipole moment,

    P = 2qa (cos θ i^ + sin θ j^)

The net force on the dipole is always zero while net torque on the dipole is not zero.


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