question_answer

An electric dipole placed in a non-uniform electric field experiences :

A)  both, a torque and a net force

B)  only a force but no torque

C)  only a torque but no net force

D)  no torque and no net force

Correct Answer: A

Solution :

An electric dipole is a system of two equal and opposite point charges separated by a small distance. When placed in a non-uniform electric field the two poles experience unequal forces EQ, EQ,. Thus, in addition to torque \[y\] There is also an external unbalanced force acting on the dipole. Hence, there would be translatory as well as rotatory motion. The dipole would move from the weaker to the stronger parts of the non-uniform field, as it oscillates.