First slide

Magnetic flux and induced emf

Question

A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when

Moderate

A

The plane of the coil is horizontal
B

The plane of the coil makes an angle of 45° with the magnetic field
C

The plane of the coil is at right angles to the magnetic field
D

The plane of the coil makes an angle of 30° with the magnetic field

Solution

Emf = $e = e_{0} \sin θ$ e will be maximum when $θ$ is 90^o i.e. plane of the coil will be horizontal.

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