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A charge q(gt0) moves towards the centre...

A charge q(gt0) moves towards the centre of a circular loop of radius R along its axis. The magnitude of B along the periphery of the loop is

A

zero

B

`(mu_(0))/(4pi)(qvR)/(sqrt((R^(2)+x^(2))^(3)))`

C

`(qvR)/(sqrt(R^(2)+x^(2)))`

D

none of these

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The correct Answer is:
B
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