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

-(e) The loop has now entirely left the field.
A) forward (in the $+x$ direction).
B) backward (in the $-x$ direction).
C) zero.
D) some other direction (specify).

Question

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
 
-(e) The loop has now entirely left the field.
A) forward (in the $+x$ direction). 
B) backward (in the $-x$ direction). 
C) zero. 
D) some other direction (specify).

Quizplus · Accepted Answer

When the loop has entirely left the magnetic field, there is no change in magnetic flux through the loop anymore, so according to Faraday's law of electromagnetic induction, the induced current is zero.

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

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