A small coil is introduced between the p...

A small coil is introduced between the poles of an electromagnet so that its axis coincides with the magnetic field direction. The number of turns is `n` and the cross sectional area of the coil is `A`. When the coil turns through `180^(@)` about its diameter, the charge flowing through the coil is `Q`. the total resistance of the circuit is `R`. what is the magnitude of the magnetic induction?

`(QR)/(nA)`

`(2QR)/(nA)`

`(Qn)/(2RA)`

`(QR)/(2nA)`

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