Question

An electric dipole is placed in a non-uniform electric field $\vec{E}.$The electric field is along x direction.The dipole will experience .

• A. A torque when the dipole is parallel to $\vec{E}$
• B. A torque when the dipole makes an angle with $\vec{E}$
• C. A force perpendicular to $\vec{E}$
• D. A force when the dipole is parallel to $\vec{E}$

Answer 1

Answer: (B), (D)

For parallel condition, the line of action of
forces is same, so no torque. But F = q $\left(E_{1}-E_{2}\right)\ne0$
$If E_{1}=E_{2} or E_{1}\ne E_{2}$
$\tau\ne0$