Question

A copper wire and a tungsten wire have the same length and same potential difference applied...

A copper wire and a tungsten wire have the same length and same potential difference applied to them. (a) What is the ratio of their radii if the current is to be the same? (b) Can a choice of radii be made such that the current density in each is the same?

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Answer #1

(a)

where and are the resistivities of copper and tungsten respectively.

(b)

No choice can be made such that the current density in each is the same.(Since the current density depends on resistivity which can't be same for copper and tungsten).

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