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Q.

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

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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

answer is A.

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Detailed Solution

Emf = e=e0sin⁡θ  e will be maximum when θ is 90o i.e. plane of the coil will be horizontal.
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