Chapter 21, Problem 11P

A cardboard tube is wrapped with windings of insulated wire that are connected to a resisitor. The tube is placed into a magnetic field that is changing with time. Determine whether the induced current in the resistor R is directed from left to right or from right to left or is zero for (a) Figure 21.47a with the magnetic field increasing, (b) Figure 21.47b with the field decreasing, and (c) Figure 21.47c with the field increasing.(Consider only the magnetic flux through the tube.)

Figure 21.47

Problem 11.