An electric dipole consists of two opposite charges of magnitude $1\mu \mathrm{C}$ separated by a distance of 2cm. The dipole is placed in an electric filed ${10}^{-5} {\mathrm{Vm}}^{-1}$. The maximum torque does the field exert on the dipole is

Given data: A dipole with two opposite charges of magnitude 1μC

Concept used: Electric dipole

Detailed solution:

For torque to be maximum, the angle between electric field and dipole moment must be 90⁰

$\tau =P\times E\sin \theta =P.E=\left(q\times 2d\right)E$

$\Rightarrow \tau =\left(1\times {10}^{-6}\right)\left(2\times {10}^{-2}\right)\left({10}^{-5}\right)=2\times {10}^{-13}$

The correct option is B.