A conducting rectangular loop of mass M, resistance R, and dimensions w by ? falls from rest into a magnetic field B as shown in figure. 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 v_T = MgR/B²w²

(b) Why is vT proportional to R?

(c) Why is it inversely proportional to B²?

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