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Type:Magnetic dipole moment

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Magnetic dipole moment is classically the maximum torque that a magnet would feel when placed within an external magnetic field of unit strength. It could also be defined as the current which, when passed through a coil of unit inductance, would generate a magnetic field of unit strength at unit distance.

The classic SI unit of magnetic dipole moment has a preferred definition and two acceptable definitions. In addition, this type supports a number of units that occasionally appear in the scientific literature and might possibly be units of the same concept.

SI:

Basic unit:

  • 1 N-m/T (that is, one newton-meter of torque in a one-tesla field).

Alternative modes of expression:

  • 1 J/T
  • 1 A-m²

CGS units:

  • 1000 dyn-cm/G
  • 1000 erg/G
  • 10000 A-cm²

Some authors have lately calculated "magnetic dipole moments" of celestial bodies by multiplying measured equatorial-surface magnetic flux densities (usually in gauss or G) by planetary radii.

The equation they have been using is:

p = B \cdot R^3

In fact, the proper equation is:

p = B \cdot R^3 \cdot \frac{4\pi}{\mu_0}

where

\mu_0 \ \overset{\underset{\mathrm{def}}{}}{=}\ 4 \pi\ \times \ 10^{-7}\ N/A²

Therefore, for the sake of convertibility, this type will support the following expressions:

  • .0000001 T-m³-4π/μ₀
  • 1000 G-cm³-4π/μ₀

Properties of type "Magnetic dipole moment"

Showing 2 properties using this type.

C

P

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