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Re: Re: Re: Re: Re: Re: What Is Magnetic Field

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Posted by Alexander on February 22, 2001 00:28:50 UTC

Div D = 4pr
Div B = 0

where r is the volume density of charge distribution.

Other 2 equations also contain charges (and currents = time derivatives of charges).

In a vacuum the density of charge is 0 (and thus the density of currents too) thus the e/m wave equation as a consequence.

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