A loop with a resistance of 4.0 is pushed to the left at a constant speed of 2.0 m/s by a 24 N force.At the instant shown in the figure,the loop is partially in and partially out of a uniform magnetic field.An induced current flows from left to right through the resistor.The length and width of the loop are 2.0 m and 1.0 m,respectively.

-What is the direction of the magnetic field?
A)to the left
B)to the right
C)out of the paper
D)into the paper
E)toward the top of the page

Question

A loop with a resistance of 4.0  is pushed to the left at a constant speed of 2.0 m/s by a 24 N force.At the instant shown in the figure,the loop is partially in and partially out of a uniform magnetic field.An induced current flows from left to right through the resistor.The length and width of the loop are 2.0 m and 1.0 m,respectively.
 
-What is the direction of the magnetic field?
A)to the left 
B)to the right 
C)out of the paper 
D)into the paper 
E)toward the top of the page

Quizplus · Accepted Answer

According to Lenz's law, the direction of the induced current and magnetic field generated by the loop will oppose the change in magnetic flux. As the loop is moving to the left, the magnetic field must be directed into the paper, which will generate a magnetic flux in the opposite direction (out of the paper) to oppose the change. Therefore, the correct answer is option D, into the paper.

A Loop with a Resistance of 4