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Q.7 A cylindrical conductor with circular cross-section has radius a and resistivity p and carries a...

Q.7 A cylindrical conductor with circular cross-section has radius a and resistivity p and carries a constant current I in the +j direction.

(c) What are the magnitude and direction of the Poynting vector S at the same point ( just inside the wire at a distance a from the axis)?

(d) Use the result in part (c) to find the rate of flow of energy into the volume occupied by a length L of the conductor. Compare your result to the rate of generation of thermal energy in the same volume.

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