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A current l flows through a closed loop ...

A current l flows through a closed loop as shown in figure .The magnetic field at the centre O is

A

`(mu_(0)l)/(2piR)(pi-theta+tantheta)`

B

`(mu_(0)l)/(2piR)(pi-theta+sintheta)`

C

`(mu_(0)l)/(2piR)(theta+sintheta)`

D

None of these

Text Solution

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The correct Answer is:
A
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