Initially a rectangular coil with length vertical is moving out with constant velocity 'v' in a constant magnetic field 'B' towards right. Now the same coil is rotated through 90^ in same plane in same magnetic field B and the coil is moving with same velocity v . The magnitude of induced e.m.f. is now

Step-by-step solution

For a conductor moving perpendicular to a magnetic field, the induced e.m.f. is governed by = B l v , where l is the length cutting flux lines perpendicularly. The rectangular coil has dimensions L (length) and w (width). Initially, with L vertical, the induced e.m.f. is _ initial = B L v . After a 90^ rotation, the vertical side becomes w , so _ final = B w v . The magnitudes compare as _ final > _ initial if w > L , _ final