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The property which is not of an electromagnetic wave travelling in free space is that:

(1) they are transverse in nature.

(2) the energy density in electric field is equal to energy density in magnetic field.

(3) they travel with a speed equal to

(4) they originate from charges moving with uniform speed.

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Correct option is (4) they originate from charges moving with uniform speed.

The property which is not of an electromagnetic wave travelling in free space is that they originate from charges moving with uniform speed.

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