In Fig. 30-59, a long rectangular conducting loop, of width L , resistance R, and mass m, is hung in a horizontal, uniform magnetic field `vecB` 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 `v_(t)`.

Explanation

`v_(t) = mgR//B^(2)L^(2)`