Question

If an electric dipole of moment $\overrightarrow{p}$ is placed in electric field of strength $\overrightarrow{E}$ , then which of the following gives the potential energy of the dipole ?

• A. $\overrightarrow{p}.\overrightarrow{E}$
• B. $-\overrightarrow{p}.\overrightarrow{E}$
• C. $|\overrightarrow{p}\times \overrightarrow{E}|$
• D. None of the above

Answer 1

Answer: (B)

$-\overrightarrow{p}.\overrightarrow{E}$

Answer 2

$U_p = - \overrightarrow{p} . \overrightarrow{E}.$