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Various Magnetic Quantities |
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| Quantity | Symbol [Units] | Physical Meaning |
| Total magnetic
field (also known as magnetic flux density) |
B[T] | The total magnetic field determines magnetic interaction such as the Lorentz force, F = qv´B. B = B0 + μ0M = μ0(H + M) |
| External field | B0[T] | The portion of the magnetic field in a substance due to current-carrying components |
| Magnetization field | Bm[T] | Field in a substance due the substance itself, Bm = μ0M |
| Magnetic field strength | H[A/m] | H = B0/μ0 is used to represent the effects of external currents in wires |
| Magnetization vector | M[A/m] | Magnetic moment per unit volume of substance. |
| Magnetic susceptibility | χ [ ] | Expresses
relationship between the magnetic field strength and the magnetization
vector, M = χH.
(Holds for para- and di- but not for ferro-magnetic substances. χ is positive for paramagnetic substances and negative for diamagnetic substances.) |
| Magnetic permeability | μm[T×m/A] | Expresses the relationship between the total magnetic field and the magnetic field strength, B = μmH. Note that μm =μ0(χ + 1). |