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List of electromagnetism equations

From Wikipedia, the free encyclopedia

List of electromagnetism equations
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This article summarizes equations in the theory of electromagnetism.

Definitions

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Lorentz force on a charged particle (of charge q) in motion (velocity v), used as the definition of the E field and B field.

Here subscripts e and m are used to differ between electric and magnetic charges. The definitions for monopoles are of theoretical interest, although real magnetic dipoles can be described using pole strengths. There are two possible units for monopole strength, Wb (Weber) and A m (Ampere metre). Dimensional analysis shows that magnetic charges relate by qm(Wb) = μ0 qm(Am).

Initial quantities

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Electric quantities

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Continuous charge distribution. The volume charge density ρ is the amount of charge per unit volume (cube), surface charge density σ is amount per unit surface area (circle) with outward unit normal , d is the dipole moment between two point charges, the volume density of these is the polarization density P. Position vector r is a point to calculate the electric field; r is a point in the charged object.

Contrary to the strong analogy between (classical) gravitation and electrostatics, there are no "centre of charge" or "centre of electrostatic attraction" analogues.[citation needed]

Electric transport

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Electric fields

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Magnetic quantities

Magnetic transport

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Magnetic fields

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Electric circuits

DC circuits, general definitions

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AC circuits

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Magnetic circuits

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Electromagnetism

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Electric fields

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Summary of electrostatic relations between electric potential, electric field and charge density. Here, .

General Classical Equations

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Magnetic fields and moments

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Summary of magnetostatic relations between magnetic vector potential, magnetic field and current density. Here, .

General classical equations

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Electric circuits and electronics

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Below N = number of conductors or circuit components. Subscript net refers to the equivalent and resultant property value.

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More information , Capacitor charge ...
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See also

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Footnotes

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Sources

Further reading

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