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Magnetic inductance : ウィキペディア英語版
Magnetic inductance

:''Magnetic inductance is not to be confused with "Magnetic induction", which usually refers to Magnetic field.''
In a magnetic circuit, ''magnetic inductance (inductive magnetic reactance)'' is the analogy to inductance in an electrical circuit. Magnetic inductance is a concept in the gyrator-capacitor model for magnetic systems.In the SI system, it is measured in units of -Ω−1. This model makes magnetomotive force (mmf) the analog of electromotive force in electrical circuits, and time rate of change of magnetic flux the analog of electric current. The gyrator-capacitor model is a lumped-element model for analysis of magnetic fields.
For phasor analysis the magnetic inductive reactance is:
:x_\mathrm = \omega L_\mathrm
Where:
:L_\mathrm is the magnetic inductivity (SI Unit: -s·Ω−1)
:\omega is the angular frequency of the magnetic circuit
In the complex form it is a positive imaginary number:
:jx_\mathrm = j\omega L_\mathrm
The magnetic potential energy sustained by magnetic inductivity varies with the frequency of oscillations in electric fields. The average power in a given period is equal to zero. Due to its dependence on frequency, magnetic inductance is mainly observable in magnetic circuits which operate at VHF and/or UHF frequencies.
The notion of magnetic inductivity is employed in analysis and computation of circuit behavior in the gyrator-capacitor model in a way analogous to inductance in electrical circuits.
==See also==

*Magnetic inductive coil

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