A conducting rectangular loop of mass M , resistance R , and dimensions w by l falls from

A conducting rectangular loop of mass M, resistance R, and dimensions w by l falls from rest into a magnetic field  as shown in Figure P20.24. 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 vT proportional to R? (c) Why is it inversely proportional to B2?