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Gaussian units
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=== Units for magnetism === In the Gaussian system, unlike the ISQ, the electric field {{math|'''E'''{{ssup|G}}}} and the [[magnetic field]] {{math|'''B'''{{ssup|G}}}} have the same dimension. This amounts to a factor of [[speed of light|{{mvar|c}}]] between how {{math|'''B'''}} is defined in the two unit systems, on top of the other differences.<ref name=Littlejohn/> (The same factor applies to other magnetic quantities such as the [[magnetic field]], {{math|'''H'''}}, and [[magnetization]], {{math|'''M'''}}.) For example, in a [[Sinusoidal plane-wave solutions of the electromagnetic wave equation|planar light wave in vacuum]], {{math|1={{abs|'''E'''{{ssup|G}}('''r''', ''t'')}} = {{abs|'''B'''{{ssup|G}}('''r''', ''t'')}}}} in Gaussian units, while {{math|1={{abs|'''E'''{{ssup|I}}('''r''', ''t'')}} = ''c'' {{abs|'''B'''{{ssup|I}}('''r''', ''t'')}}}} in the ISQ.
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