Question

A dipole of dipole moment $\overrightarrow{p}$ is kept along an electric field $\overrightarrow{E}$ such that $\overrightarrow{E}$ and $\overrightarrow{p}$ are in the same direction. Find the work done in rotating the dipole by an angle $\pi$.

• A. $W=3Ep$.
• B. $W=2Ep$.
• C. $W=4Ep$.
• D. $W=5Ep$.

Answer 1

The correct option is B $W=2Ep$.

Dipole moment $=\overline{p}$

Electric field $=\overline{E}$

Work done $=W=E.2p=2pE$