Question

The picture shows a rectangular current-carrying loop in a uniform magnetic field that is directed right. The loop is free to rotate about the axis shown as the dashed line in the top view. 

(a) Select all the correct statements about this situation from the list below. 

As seen from the side view, the initial net torque on the loop is clockwise 

As seen from the side view, the initial net torque on the loop is counterclockwise 

As seen in the top view, the force from the magnetic field on the side bc of the loop is to the right 

As seen in the top view, the force from the magnetic field on the side bc of the loop is out of the page 

As seen in the top view, the force from the magnetic field on the side bc of the loop is into the page 

As the loop rotates, the force from the magnetic field on the side bc of the loop stays the same magnitude and direction 

As the loop rotates, the force from the magnetic field on the side bc of the loop changes direction 

As the loop rotates, the force from the magnetic field on the side bc of the loop changes magnitude 

As the loop rotates, the net force on the loop is always zero 

For the rest of this problem, use these values: 

the width of the loop is 12.0 cm; 

the length of the loop is 60.0 cm; 

the current I = 4.00 amps; 

the field B = 6.00 T. 

(b) Calculate the net torque on the loop when the loop is in the orientation shown above. 

(c) Calculate the net torque on the loop when the loop, as seen from the side view, has rotated through an angle of 18.0 degrees.  

Answer 1