Why electromagnetic waves aren't affected by electric or magnetic fields

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Denton
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Why is it that electromagnetic waves, made up of constantly changing electric and magnetic fields are neither affected by electric or magnetic fields?...
 

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It's because Maxwell's equations are linear in the fields [itex]\vec E[/itex] and [itex]\vec B[/itex]. They contain no terms involving products of the fields or their derivatives.
 

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