A circular wire loop with a radius r is placed so the plane of the loop is perpendicular to a uniform magnetic field of strength B. The loop lies in the plane of the paper and the magnetic field points into the paper.
a. Theradius changes from 10.0 cm to 20.0 cm in a time of 8.0 s.The magnetic field is 3.0 T. The loop has a resistance of 5.0 ohms. On average, what is thevalue of the current while the radius is changing?