55:15
University Physics with Modern Physics
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 $\textbf{Fig. E29.8}$. The field is changing with time, according to $B(t2) =$ (1.4 T)$e^{-(0.057 s-1)}t$. (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.