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Gauss' law for magnetism : ウィキペディア英語版
Gauss's law for magnetism

In physics, Gauss's law for magnetism is one of the four Maxwell's equations that underlie classical electrodynamics. It states that the magnetic field B has divergence equal to zero,〔 in other words, that it is a solenoidal vector field. It is equivalent to the statement that magnetic monopoles do not exist. Rather than "magnetic charges", the basic entity for magnetism is the magnetic dipole. (Of course, if monopoles were ever found, the law would have to be modified, as elaborated below.)
Gauss's law for magnetism can be written in two forms, a ''differential form'' and an ''integral form''. These forms are equivalent due to the divergence theorem.
The name "Gauss's law for magnetism"〔
〕 is not universally used. The law is also called "Absence of free magnetic poles".〔
〕 (or some variant); one reference even explicitly says the law has "no name".〔
〕 It is also referred to as the "transversality requirement"〔
〕 because for plane waves it requires that the polarization be transverse to the direction of propagation.
==Differential form==

The differential form for Gauss's law for magnetism is:
where ∇• denotes divergence, and B is the magnetic field.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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