Chapter 21, Problem 30P

* You build a coil of radius r (m) and place it in a uniform $\stackrel{\to }{B}$ field oriented perpendicular to the coil's surface What is the total electric charge that passes through the coil’s wire loops if the $\stackrel{\to }{B}$ field decreases at a constant rate to zero? The resistance of the coil's wire is $R\left(\Omega \right)$.