A current I flows an infinitely long wir...

A current `I` flows an infinitely long wire with cross section in the form of a semi - circular ring of radius `R`. The magnitude of the magnetic induction along its axis is :

`(mu_(0)I)/(2pi^(2)R)`

`(mu_(0)I)/(2piR)`

`(mu_(0)I)/(4piR)`

`(mu_(0)I)/(pi^(2)R)`

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