Use the following figure for the next problem.
-A rectangular coil moving at a constant speed v enters a region of uniform magnetic field from the left.While the coil is entering the field,the direction of the magnetic force is
A)1
B)2
C)3
D)4

Question

Use the following figure for the next problem. 
-A rectangular coil moving at a constant speed v enters a region of uniform magnetic field from the left.While the coil is entering the field,the direction of the magnetic force is
A)1 
B)2 
C)3 
D)4

Quizplus · Accepted Answer

According to the right-hand rule, when a current-carrying wire (or coil, in this case) enters a magnetic field, the direction of the magnetic force on the wire is perpendicular to both the direction of the current and the magnetic field. 
In this case, the current in the wire is clockwise, and the magnetic field is directed into the page. Therefore, the direction of the magnetic force on the coil is downward, as shown by the arrow in choice C.

Use the Following Figure for the Next Problem