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A ring of radius R is placed in the plan...

A ring of radius R is placed in the plane its centre at origin and its axis along the x-axis and having uniformly distributed positive charge. A ring of radius `r(ltltR)` and coaxial with the larger ring is moving along the axis with constant velocity , then the variation of electrical flux `(phi)` passing through the smaller ring with position will be best represent by :

A

B

C

D

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The correct Answer is:
c
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