Chapter 21, Problem 3MCP

A metal ring is oriented with the plane of its area perpendicular to a spatially uniform magnetic field that increases at a steady rate. After the radius at the ring is doubled, while the rate of incense of the field is cut in half, the emf induced in the ring.

1. A.    remains the same.
2. B.     increases by a factor of 2
3. C.     increases by a factor of 4
4. D.    decreases by a factor of 2.