week2 (dragged) 9

week2 (dragged) 9 - forces(like mechanical forces are...

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EM fields are real physical substance ! Electromagnetic fields are real, these are not just mathematical concepts . EM fields is another material substance: one can assign energy-density to electromagnetic field. Empty space with EM field has more energy than just empty space. ! There is no “substance” that “transports” EM
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Unformatted text preview: forces (like mechanical forces are transported by the medium, sound is transported by medium), EM wave propagate “on their own”, no medium to carry. ! (Actually, gravitational force is not “real”). 8 Thursday, September 2, 2010...
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