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An electromagnetic wave is traveling in a vacuum. The electric field E of the wave is doubled. What happens to the magnetic field B, the total energy density u, and the intensity S of the wave? - B doubles, u doubles, S doubles - B doubles, u increases by a factor of four, S increases by a factor of four - B increases by a factor of four, u increases by a factor of four, S increases by a factor of four - B doubles, u increases by a factor of four, S doubles - B doubles, u decreases by a factor of two, S decreases by a factor of two
Sagot :
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