A positive charge \( Q \) is uniformly distributed along a circular ring of radius \( R \). A sm...

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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 as shown in figure. Then
\( \mathrm{P} \)
(a) if \( q0 \), and is displaced away
W
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
(d) all of the above.
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