A copper wire and an iron wire of the same length have thesame potential differe

Question

A copper wire and an iron wire of the same length have thesame potential difference applide to them.

(A) What must be the ratio of the radii if the currents in the twowires are to be the same?

(B) Can the current denstities be made the same by suitable choicesof radii? A copper wire and an iron wire of the same length have thesame potential difference applide to them.

(A) What must be the ratio of the radii if the currents in the twowires are to be the same?

(B) Can the current denstities be made the same by suitable choicesof radii?

Explanation / Answer

a)copper : 1.68e-8 iron : 1.0e-7 = 10e-8 R = pl/a copper : iron 1.68/1^2 = 10/x^2 x^2 = 10/1.68 x = 2.44 copper : iron (radius) = 1:2.44 b) no. since current densities is current per square meter, the area of the iron will be larger as compare to copper. therefore, their current densities will be different.

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