In Figure a long rectangular conducting loop, of width L, resistance R, and mass m, is hung

Question:

In Figure a long rectangular conducting loop, of width L, resistance R, and mass m, is hung in a horizontal, uniform magnetic field B that is directed into the page and that exists only above line aa. The loop is then dropped; during its fall, it accelerates until it reaches a certain terminal speed v t ignoring air drag, find an expression for vt.