Chapter 29, Problem 29.8E

CALC A flat, circular, steel loop of radius 75 cm is at rest in a uniform magnetic field, as shown in an edge-on view in Fig. F.29.8. The field is changing with time, according to $\text{B}(\text{t})=(1.4T){\text{e}}^{-(0.057s^{-1})\text{t}}$ (a) Find the emf induced in the loop as a function of time, (b) When is the induced emf equal to $\frac{1}{10}$ of its initial value? (c) Find the direction of the current induced in the loop, as viewed from above the loop.

Figure F.29.8