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 $45^{\circ }$ 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 $30^{\circ }$ with the magnetic field

Answer 1

Answer: (A)

$EMF=e=e_0\sin \theta ;e$ will be maximum when $\theta$ is $90^{\circ }$ i.e., plane of the coil will be horizontal.