Figure 30-47 shows a closed loop of wire that consists of a pair of equal semicircles, of radius 3. 7 cm, lying

in mutually perpendicular planes. The loop was formed by folding a flat circular loop along a diameter until

the two halves became perpendicular to each other. A uniform magnetic field of magnitude 76 mT is

directed perpendicular to the fold diameter and makes equal angles (of 45°) with the planes of the

semicircles. The magnetic field is reduced to zero at a uniform rate during a time interval of 4. 5 ms. During

this interval, what are the (a) magnitude and (b) direction (clockwise or counterclockwise when viewed

along the direction of B of the emf induced in the loop?