What is the term for the measure of the turning effect of a spinning charge in a magnetic field?

The measure of the turning effect of a spinning charge in a magnetic field is referred to as the magnetic moment. This concept is essential in understanding how magnetic fields interact with various materials and charged particles.

The magnetic moment quantifies the strength and the direction of a magnetic source, which results from the motion of charges. When a charge spins, it creates a magnetic field due to its movement, and the magnetic moment describes how effectively this charge can produce a torque when placed in an external magnetic field. The larger the magnetic moment, the greater the torque that will be produced, which can influence the orientation of a magnetic dipole in the field.

Magnetic field strength relates to the intensity of the magnetic field at a given point but does not measure the turning effect itself. Magnetic flux refers to the total magnetic field passing through a surface but is not related to the turning effect of charges. Magnetic polarity deals with the orientation (north or south) of the magnetic field lines but does not specifically describe the torque produced by spinning charges. Thus, the term magnetic moment accurately captures the relationship between a spinning charge and its effect in a magnetic field.