Half part of ring is uniformly positively charged and other half is uniformly negatively charged. Ring is in…
Half part of ring is uniformly positively charged and other half is uniformly negatively charged. Ring is in equilibrium in uniform electric field as shown and free to rotate about an axis passing through its centre and perpendicular to plane. The equilibrium is
stable
unstable
neutral
can be stable or unstable
Solution
Assuming ring as dipole, then dipole moment $\vec{P}$ and $\vec{E}$ are in same direction, so potential energy $U=-P E$
$\therefore$
(a)
