Torque due to electric diploe in non uniform electric field ?
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Answers
Answer:
When electric field is not uniform, the net force will be non-zero, there will also be torque on the system.
When dipole moment p is parallel or anti-parallel to external field E, the net torque is zero, but there is a force on the dipole E which is not uniform. It is seen that when p is parallel to E, dipole has a net force in the direction of increasing field and when p is antiparallel to E, the net force on dipole is in the direction of decreasing field. Force depends on the orientation of dipole moment with respect to the external field.
Hence, an electric dipole placed in a non-uniform electric field experiences both a torque and a net force.
Answer:
If an electric dipole is placed in a nonuniform electric field, then the positive and the negative charges of the dipole will experience a net force. And as one end of the dipole is experiencing a force in one direction and the other end in the opposite direction, so the dipole will have a net torque also.
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The premise of your question is faulty in that when a dipole is placed in a non-uniform electric field, the direction of the net force experienced by it is not always along the direction of increasing electric field. Let us consider a non-uniform electric field →E increasing in the direction left to right.