Question

A circular coil is rotating at constant angular velocity about a diameter as axis in a uniform magnetic field. When the value of one of the following quantities is increased, the magnitude of the induced e.m.f. in the coil will increase. The quantity is

A. the radius of the coil. B. the period of rotation of the coil.
C. the number of turns of the coil. D. the magnetic flux density.
E. none of the above

Answer 1

A. If the radius in increased V is increasing https://dl.dropbox.com/u/63664351/Physics/20130113_201101.jpg
B. If the period is increasing, the frequency (N/t) is decreasing hence V is decreasing.
C. If N is increasing, so does V.
D. If B is increasing so does V.

So the answer is A C D? What do you guys think?

Answer 2

Correct,