A dipole is placed in a uniform electric field, its potential energy will be minimum when the angle between…
A dipole is placed in a uniform electric field, its potential energy will be minimum when the angle between its axis and field is
zero
$\pi$
$\frac{\pi}{2}$
$2 \pi$
Solution
Potential energy of a electric dipole in electric field is given as
$
U=-p B \cos \theta
$
For minimum value $U, \cos \theta$ should be maximum as 1 .
i.e., $\cos \theta=1=\cos \theta^{\circ} \Rightarrow \theta=0^{\circ}$