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

A conducting rectangular loop of mass M, resistance R, and dimensions w by ℓ falls from rest into a magnetic field B as shown in Figure P31.43. During the time interval before the top edge of the loop reaches the field, the loop approaches a terminal speed vT.
(a) Show that vr = MgR / B2w2
(b) Why is vT proportional to R?
(c) Why is it inversely proportional to B2?

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Bout