Question

When an electric dipole $\overrightarrow{p}$ is kept in a uniform electric field $\overrightarrow{E}$ then for what of a value of the angle between $\overrightarrow{p}$ and $\overrightarrow{E}$, torque will be maximum:

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

Answer 1

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

$\overline{P}\times \overline{E}$

$=\overline{P}\overline{E}\sin {90}^0$

for maximum $\overline{P}\overline{E}$ then $\theta$ will be ${90}^0$.