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A positive charge \( Q \) is uniformly distributed along a circular ring of radius \( R \). A small test charge \( q \) is placed at the centre of the ring . Then
(a) If \( q0 \) and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre.
(b) If \( q0 \) and is displaced away from the centre in the plane of the ring, it will never return to the centre and will continue moving till it hits the ring.
(c) If \( q0 \), it will perform SHM for small displacement along the axis.
\( \mathrm{P} \)
W
(d) \( q \) at the centre of the ring is in an unstable equilibrium within the plane of the ring for \( q0 \).
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