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Electromagnetic waves physics
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Electromagnetic waves physics
asked
Nov 25, 2021
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JackTerrance
A long straight wire of length l, radius of cross section r has resistance R. If it carries a current I ,what is the poynting vector on its surface? Select the correct answer from above options
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Nov 25, 2021
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JackTerrance
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Electric field in wire, E = V L = I R L E (V=IR, ohm's Law) and, H = I 2 π a H (current distributed along surface of wire) S = E H = I 2 R 2 π a L S
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