Equal potentials are applied on an iron and a copper wire of same length. In order to have the same current flow in the two

Question

Equal potentials are applied on an iron and a copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron) / r (copper) of their radii must be : [Give that : specific resistance of copper = 1.7 x 10-8 ohm - m ]:

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