![]() With a D82 magnet sitting on my desk, the only external magnetic field is the earth’s magnetic field, with a strength of about 0.5 gauss (0.00005 tesla). If you stick this magnet in some external magnetic field, it will tend to feel a (maximum) torque of about 3.74 inch pounds for every tesla of magnetic field strength. The magnetic torque of a D82 magnet is 3.74 inch pounds per tesla (in lb / T). With all due respect to the metric system, we could just as well express torque in inch pounds. The magnetic torque of a D82 magnet is 0.422 newton meters per tesla (N m / T). That’s torque per magnetic field strength. It’s equivalent to newton meters per tesla (N m / T). While we’re at it, those units of amperes x meters squared sound strangely electrical for something that’s supposed to be a torque. The magnetic moment torque of a D82 magnet is 0.422 A m 2. It’s a fancy word that physicists and engineers use when they really mean “torque.” It’s a force applied at a distance, like foot-pounds of torque applied with a wrench. ![]() We'll come back to dipoles later.Īlso, this word “moment” sounds like jargon. There might be less confusion on this topic if we just say it has a magnetic moment of 0.422 A m 2, dropping the word “dipole” entirely. We’re not fond of the word dipole in this context, even though we use it ourselves. The magnetic dipole moment of a D82 magnet is 0.422 A m 2. Let's try rephrasing our Calculator's answer to make some sense of it. Whew, that's a mouthful! While that definition might satisfy the mathemeticans among us, we're looking for a more practical, working definition. the limit of a closed loop of electric current (or a pair of poles) as the size of the source is reduced to zero while keeping the magnetic moment constant. The Wikipedia article defines a magnetic dipole as: You can also calculate it using the formula, also mentioned in our glossary. Let’s be specific: What is the magnetic dipole moment of a 1/2” diameter x 1/8” thick D82 disc magnet? It’s not listed on the D82 page, but we can calculate it using our Pull Force Calculator as 0.422 A m 2. Over the magnetic permeability of free space, μ o (T m / A).
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