Electronics: Difference between revisions
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===Classic Emag=== | ===Classic Emag=== | ||
* Usable whenever distances are large enough and/or field strengths low enough that quantum effects can be ignored. | * Usable whenever distances are large enough and/or field strengths low enough that quantum effects can be ignored. | ||
* For a manifestly Lorentz-covariant theory, one must use [https://en.wikipedia.org/wiki/Four-current four currents] and the [https://en.wikipedia.org/wiki/Electromagnetic_tensor electromagnetic tensor] or [https://en.wikipedia.org/wiki/Electromagnetic_four-potential four-potential]. | |||
** This formulation makes plain the mixing of <b>E</b> and <b>B</b>. | |||
* An electric vector field <b>E</b> and a magnetic vector field <b>B</b> exist at all points. | * An electric vector field <b>E</b> and a magnetic vector field <b>B</b> exist at all points. | ||
* A particle having charge c (an integer multiple of <i>e</i>) is acted upon by the Lorentz force: | * A particle having charge c (an integer multiple of <i>e</i>) is acted upon by the Lorentz force: | ||