A long straight wire of length l, radius of cross section r has resi

1.	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?
Answer» 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) \(S=EH=\frac{I^2R}{2\pi aL}\)

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?

Answer»

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)

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

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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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