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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?

A

`(QR)/(nA)`

B

`(2QR)/(nA)`

C

`(Qn)/(2RA)`

D

`(QR)/(2nA)`

Text Solution

Verified by Experts

The correct Answer is:
D
Induced charge `Q=-(NBA)/(R ) (cos theta_(2)-cos theta_(1))`
`-(NBA)/(R )(cos180^(@)-cos0^(@)impliesB=(QR)/(2NA)`
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A2Z-ELECTROMAGNETIC INDUCTION-Section D - Chapter End Test
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  13. A coil having n turns and resistance R Omega is connected with a galva...

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  14. A metal conductor of length 1m rotates vertically about one of its end...

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  15. A coil of inductance 300mh and resistance 2Omega is connected to a sou...

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