A square conducting loop of mass m , side l and resistance R is dropped into a region with a uniform horizontal magnetic field B whose direction is perpendicular to the plane of the falling loop. The loop will reach a terminal velocity v given by
1
\(\rm v=\frac{mgR}{(Bl)^2}\)
2
\(\rm v=\frac{2mgR}{B^2l^2}\)
3
\(\rm v=\frac{mgR}{2B^2l^2}\)
4
None of these