A uniformly charged ring of radius 15 cm carries a total charge 60 µC. Where should a point charge 3 µC be kept on the axis of the ring so that it experiences maximum force?
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a
15 cm from the centre
b
13.8 cm from the centre
c
10.6 cm from the centre
d
7.5 cm from the centre
answer is C.
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Detailed Solution
On the axis of a ring, the electric field is maximum at x=R2=15 cm2=10.6 cm