A Circular Loop of Wire Is Rotated at Constant Angular

Multiple Choice

A circular loop of wire is rotated at constant angular speed about its symmetry axis, whose direction can be varied, in a uniform magnetic field pointing vertically upward. To get no induced emf, the loop's axis of rotation should

A) make an angle of 30^o with the vertical.
B) make an angle of 45^o with the vertical.
C) make an angle of 60^o with the vertical.
D) be vertical.
E) be horizontal.