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Q.

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

13.8 cm from the centre

b

7.5 cm from the centre 

c

10.6 cm from the centre

d

15 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

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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?