Equal potentials are applied on an iron and 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 (Given that specific resistance of iron `=1.0 xx 10^(-7) ohm-m` and specific resistance of copper `=1.7 xx 10^(-8) ohm-m`)A. About 1.2B. About 2.4C. About 3.6D. About 4.8

Equal potentials are applied on an iron and copper wire of same length

1.	Equal potentials are applied on an iron and 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 (Given that specific resistance of iron `=1.0 xx 10^(-7) ohm-m` and specific resistance of copper `=1.7 xx 10^(-8) ohm-m`)A. About 1.2B. About 2.4C. About 3.6D. About 4.8
Answer» Correct Answer - B

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