Two metal rings 1 and 2 are placed in a uniform magnetic field which is decreasing with time their planes perpendicular to the field. If the rings are identical except that ring 2 has a thin air gap in it, which one of the following statement is correct?

A. No e.m.f. is induced in ring 1

B. An e.m.f. is induced in both the rings

C. Equal Joule heating occurs in both the rings

D. Joule heating does not occur in either ring

Answer: Option B