Question

Draw the labelled diagram of electric motor and A.C Generator.

Answer 1

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Let say at the instant, the plane of the coil is perpendicular to the direction of magnetic field i.e. area vector of coil points in same direction as that of magnetic field. So maximum flux passes through the coil.

Flux passing through the coil at ,

The coil rotates about an axis with constant angular velocity as shown in the figure. 

Angle rotated by coil in time is .

Flux passing through the coil at that instant,

Rate of change of flux

We get 

Induced emf in the coil

Answer 2

Answer:

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