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Two charges +q and-q are placed at a dis...

Two charges `+q and-q` are placed at a distance a in a uniform electric field. The dipole moment of the combination is `2aq(cos theta hati+ sin theta hatj)`, where `theta` 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 ?

A

The torque exerted by the field on the dipole vanishes.

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'.

Text Solution

Verified by Experts

The correct Answer is:
(b,c,d)

Net force on the dipole `=+qE=qE=0`
So , option (b) is correct.
Torque on the dipole , `tau=pEsinthetane0`
Here , p, E - and `theta` independent of choice of co - ordinates.
So , options (c ) and (d) are correct.
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