question_answer 27)

In a certain region of space, electric field is alongthez-direction throughout. The magnitude of electric field is, however, not constant but increases uniformly along the positive z-direction, at the rate of per metre. What are the force and torque experienced by a system having a total dipole moment equal to in the negative z-direction?  

Answer:

Suppose the dipole is along z-axis.                  Then dipole moment,                                 Here                                             Torque,                                 [p and E are opposite to each other]                 zero.