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a
q at the centre of the ring is in an unstable equilibrium within the plane of the ring for a>0
b
If q<0, it will perform SHM for small displacement along the axis
c
If q<0 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
d
If q>0 and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre
answer is A, B, C.
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