College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 41

A conducting rectangular loop of mass M , resistance R , and dimensions w by falls from rest into a magnetic field , as shown in Figure P20.67. During the time interval before the top edge of the loop reaches the field, the loop approaches a terminal speed v T.
(a) Show that
(b) Why is v T proportional to R
(c) Why is it inversely proportional to B 2