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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)I theta/4pi r`

B

`mu_(0)I theta/4pi r^(2) sin theta`

C

`mu_(0)/4 i/r theta^(@)/180^(@)`

D

`mu(0)I sin theta /4r`

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