![]() This is known as the “magnetization by rotation” effect. If there is a circular loop that carries current, we find that there is an analogous relationship between the magnetic moment of the coil and angular momentum in mechanical physics. Depending on what we are doing, we will go about calculating the magnetic moment in different ways. We are either looking at a system that involves the motion of electric charges (also known as an electric current) or we are trying to determine the intrinsic magnetism of some kind of elementary particle like the electron. Typically, when determining the magnetic moment, we are investigating one of two things. There are other higher order magnetic moments, such as the quadrupolar and octupolar variants, but they are uncommon. ![]() ![]() The vector for the magnetic moment runs along the naturally occurring axis of the dipolar magnetic field pattern. Because there are no known magnetic monopoles, the magnetic moment most commonly refers to the magnetic dipole moment. Measured in SI units of joules/tesla, the magnetic moment serves to quantify the way in which the internal magnetic properties of the system contribute to the system’s external magnetic field (also known as the part of the external magnetic field with a strength that drops off with an inverse cubic rule as a function of distance). For any given electromagnetic system, there is a measure of both the strength and direction of its magnetism known as the magnetic moment. ![]()
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