A closed coil having 50 turns, area 300 cm2, is rotated from a position where its plane makes an angle of 45º with a magnetic field 2.0 Tesla to a position perpendicular to the field in a time of 0.1 sec. The average e.m.f. induced in the coil is
1
0 V
2
15 V
3
11 V
4
none of the above