Question

Torque acting on an electric dipole in a uniform electric field is maximum if the angle between $\overrightarrow{P}$; and $\overrightarrow{E}$ is:

• A. ${180}^o$
• B. $0^o$
• C. ${90}^o$
• D. ${45}^o$

Answer 1

The correct option is C ${90}^o$

The torque acting on an electric dipole
$\tau =\overrightarrow{p}\times \overrightarrow{E}$
$=pEsin\theta$
Torque will maximum when value of $sin\theta$ will be maximum or $\theta ={90}^o$