CBSE Class 12-science Answered
why does a dipole experiences force and torque when placed in non-uniform electric field.
also when it will be placed in uniform will it be experiencing net force or torque or both. answer in detail and dont provide links
Asked by haroonrashidgkp | 22 Apr, 2018, 12:12: PM
Expert Answer
When a dipole is placed in a uniform electric field and dipole vector direction is not parallel to field direction, each chargs of dipole experiences a force. Magnitude of the two forces are equal but in opposite direction.These equal and unlike parallel forces give rise to a couple. This couple gives a torque to dipole, which rotaes the dipole and makes it to align in the direction of field. Once the dipole is aligned in the direction of field, torque vanishes( r x F will be zero, if r and F are in same direction ). Once the dipole is aligned to electric field, the net force will be zero because they are in opposite direction. Hence in uniform field, dipole experiences only torque.
When a dipole is placed in non-uniform field, there will be a torque as explained above. But once the dipole is aligned to field direction, the forces acting on the charges are are not same. Hence there will be a net force acting on the dipole in the direction of increasing field. Hence in non-uniform field, electric dipole expereinces both torque and force
Answered by Thiyagarajan K | 22 Apr, 2018, 03:07: PM
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