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OpenStudy (anonymous):
What is current density? How do you find it? For eg. Copper and aluminum are being considered for a high-voltage transmission line that must carry a current of 50 A. The resistance per unit length is to be 0.125 Ω/ km. Compute for each choice of cable material the current density. The current density for copper
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OpenStudy (anonymous):
Current density, j, is the current through the wire divided by the cross-sectional area of the wire: j=I/A.
OpenStudy (alekos):
douglas is right so you need to know the radius of the transmission line
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