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The motion of electrically charged particles cause electromagnetic waves. Electromagnetic waves with low frequencies are called electromagnetic fields, while high frequencies are
http://answers.ask.com/Science/Physics/how_are_ele...
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electromagnetic waves are produced by the changes in the sub atomic level when heat or electricity is applied to an atom electron which is present in lower energy level will obsorbs
http://wiki.answers.com/Q/How_electromagnetic_wave...
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Electric charges in oscillating motion do.
http://wiki.answers.com/Q/What_produces_electromag...
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In a vacuum
http://wiki.answers.com/Q/When_are_no_electromagne...
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