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When can a charge act as a source of ele...

When can a charge act as a source of electromagnetic wave? How are there directions of electric and magneitc field vectors, in an electromagnetic wave related to each other and to the direction of propagation of the wave?
Which physical quantity, if any has the same value for waves belonging to the differnt parts of the electromangetic spectrum?

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Velocity has the same value for waves belonging to the different parts of the electromagnetic spectrum.
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