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 |
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(b) The plane of the coil makes an angle of 45° with the magnetic field |
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(c) The plane of the coil is at right angles to the magnetic field |
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(d) The plane of the coil makes an angle of 30° with the magnetic field |