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what is the difference between constant and changing magnetic and electric fields? How do they occur? How do they form an electromagnetic wave?

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Constant Electric and Magnetic Fields are constant in magnitude and Direction. Changing Electric and Magnetic Fields are Not.

For the answer on how do they form a wave, see the picture below, Production of Electromagnetic Waves

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In free space the zero crossings of the field should be everywhere simultaneous. – dmckee Feb 28 '13 at 5:05

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