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  4. A coil has an area of 0.05 m2 and has 800 turns. After placing the coil in a magnetic field of strength 4× 10-5Wbm-2 perpendicular to the field, the coil is rotated through 90o in 0. Is. The average emf induced is

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Q. A coil has an area of $ 0.05\,{{m}^{2}} $ and has 800 turns. After placing the coil in a magnetic field of strength $ 4\times {{10}^{-5}}Wb{{m}^{-2}} $ perpendicular to the field, the coil is rotated through $ {{90}^{o}} $ in 0. Is. The average emf induced is

Jharkhand CECEJharkhand CECE 2011

Solution:

Induced emf
$ e=\frac{d\phi}{dt}=\frac{NAdB}{dt} $
$ =800\times 0.05\times \frac{4\times {{10}^{-5}}}{0.1} $
$ =0.016\,V $