A Conducting Rectangular Loop of Mass M, Resistance R, and Dimensions

Multiple Choice

A conducting rectangular loop of mass M, resistance R, and dimensions a × b is allowed to fall from rest through a uniform magnetic field which is perpendicular to the plane of the loop. The loop accelerates until it reaches a terminal speed (before the upper end enters the magnetic field) . If a = 2.0 m, B = 6.0 T, R = 40 Ω, and M = 0.60 kg, what is the terminal speed?

A) 1.6 m/s
B) 20 m/s
C) 2.2 m/s
D) 26 m/s
E) 5.3 m/s