College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 35

An N -turn square coil with side and resistance R is pulled to the right at constant speed v in the positive x -direction in the presence of a uniform magnetic field B acting perpendicular to the coil, as shown in Figure P20.66. At t = 0, the right side of the coil is at the edge of the field. After a time t has elapsed, the entire coil is in the region where B = 0. In terms of the quantities N , B , , v , and R , find symbolic expressions for (a) the magnitude of the induced emf in the loop during the time interval t , (b) the magnitude of the induced current in the coil, (c) the power delivered to the coil, and (d) the force required to remove the coil from the field. (e) What is the direction of the induced current in the loop (f) What is the direction of the magnetic force on the loop while it is being pulled out of the field