19. A uniform magnetic field B that is perpendicular to the plane of the page now passes through the loops, as shown. The field is confined to a region of radius a, where a<b, and is changing at a constant rate. The induced emf in the wire loop of radius b is
ε. What is the induced emf in the wire loop of radius 2b ?
(A) Zero
(B) E/2
(C) E
(D) 4ε
