The magnetic dipole moment of a current-carrying loop of wire is in the positive z direction. If a uniform magnetic field is in the positive x direction the magnetic torque on the loop is:
A) 0
B) in the positive y direction
C) in the negative y direction
D) in the positive z direction
E) in the negative z direction

Question

Quizplus · Accepted Answer

The magnetic torque on a current-carrying loop is given by the cross product of the magnetic dipole moment and the magnetic field. In this case, the magnetic dipole moment is in the positive z direction and the magnetic field is in the positive x direction. The cross product of these two vectors is in the positive y direction.

The Magnetic Dipole Moment of a Current-Carrying Loop of Wire