Consider an infinitely long wire carrying a current I(t), with $\frac {dI}{dt} = \lambda = constant$. Find the current produced in the rectangular loop of wire ABCD if its resistance is R, as shown in the fig.

Question

(a) $\frac {\mu_0 T \lambda}{2 \pi r} log_e (\frac {x_0}{x})$
(b) $\frac {\mu_0 T \lambda}{2 \pi r} log_e (x x_0)$
(c) $\frac {\mu_0 T \lambda}{2 \pi r} log_e (\frac {x}{x_0}$
(d) $\frac {\mu_0 T \lambda}{2 \pi r} log (\frac {x}{x_0}$