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

• 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 1

Answer: (A)

The plane of the coil is horizontal

Answer 2

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