Question: Q. 6. What is the value of the angle between the vectors $\vec{p}$ and $\vec{E}$ for which the potential energy of an electric dipole of dipole moment $p$, kept in an external electric field $\vec{E}_{2}$ has the maximum value.
A [CBSE SQP 2014]
Solution:
Ans. P.E. $=-\vec{p} \cdot \vec{E}=-p E \cos \theta$
$\therefore$ P.E. is the maximum when $\cos \theta=-1$,
i.e., $\theta=\pi\left(=180^{\circ}\right)$.
$1 / 2$
[CBSE Marking Scheme, 2014]
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