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The magnitude of magnetic induction at m...

The magnitude of magnetic induction at mid point O due to current arrangement as shown in Fig will be

A

`0`

B

`(mu_(0)l)/(2 pi a)`

C

`(mu_(0)l)/(2 pi a)`

D

`(mu_(0)l)/(4 pi a)`

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The correct Answer is:
B
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