Consider the Situation Described in Problem E9T $+x$ Direction) $-x$ Direction)

Consider the situation described in problem E9T.7. If current flows in the loop, the magnetic field will exert magnetic forces on the various loop legs, and in some cases there may be a net magnetic force on the loop. If so, we will have to exert a force to keep the loop moving at a constant velocity. In each of the five cases, determine whether the net force we have to exert is

-The loop's front end has emerged from the field.

A) forward (in the $+x$ direction) .
B) backward (in the $-x$ direction) .
C) zero.
D) some other direction (specify) .