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The source free equations can be written by the action of the exterior derivative on this 2-form. But for the equations with source terms (Gauss's law and the Ampère-Maxwell equation), the Hodge dual of this 2-form is needed. The Hodge star operator takes a p-form to a (n − p)-form, where n is the number of dimensions.
Wb = T m 2 [L] 2 [M][T] −2 [I] −1: Magnetic permeability = V·s·A −1 ·m −1 = N·A −2 = T·m·A −1 = Wb·A −1 ·m −1 [M][L][T] −2 [I] −2: Magnetic moment, magnetic dipole moment: m, μ B, Π: Two definitions are possible: using pole strengths,
This is the equation of motion of the magnetization. It describes a Larmor precession of the magnetization around the effective field, with an additional damping term arising from the coupling of the magnetic system to the environment. The equation can be written in the so-called Gilbert form (or implicit form) as: [1]: 181 [6]: 462
In physics, the magnetomotive force (abbreviated mmf or MMF, symbol ) is a quantity appearing in the equation for the magnetic flux in a magnetic circuit, Hopkinson's law. [1] It is the property of certain substances or phenomena that give rise to magnetic fields : F = Φ R , {\displaystyle {\mathcal {F}}=\Phi {\mathcal {R}},} where Φ is the ...
If two or more magnets are small enough or sufficiently distant that their shape and size is not important then both magnets can be modeled as being magnetic dipoles having a magnetic moments m 1 and m 2. In case of uniformly magnetized spherical magnets this model is precise even at finite size and distance, as the outside field of such ...
Calculated magnetization curve for a superconducting slab, based on Bean's model. The superconducting slab is initially at H = 0. Increasing H to critical field H* causes the blue curve; dropping H back to 0 and reversing direction to increase it to -H* causes the green curve; dropping H back to 0 again and increase H to H* causes the orange curve.
Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m 2]. [1] One tesla is equal to 10 4 gauss. Magnetic field drops off as the inverse cube of the distance ( 1 / distance 3 ) from a dipole source. Energy required to produce laboratory magnetic fields increases with the square of magnetic field. [2]
Deoxy-hemoglobin is generally accepted to be a complex of iron in the +2 oxidation state, that is a d 6 system with a high-spin magnetic moment near to the spin-only value of 4.9 μ B. It was proposed that the iron is oxidized and the oxygen reduced to superoxide.
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