Fewpal
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in Electromagnetic induction and alternating currents by (31 points)
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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?

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1 Answer

+1 vote
by (46.2k points)

Electric field in wire,

\(E=\frac{V}{L}=\frac{IR}{L}\) (V=IR, ohm's Law)

and,

\(H=\frac{I}{2\pi a}\) (current distributed along surface of wire)

\(S=EH=\frac{I^2R}{2\pi aL}\)

by (31 points)
Plz explain what is H. Actually I understood only that first step. Rest l didn't understand.Can u plz explain ?

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