Copper and carbon wires are connected in...

Copper and carbon wires are connected in series and the combined resistor is kept at `0^(@)C`. Assuming the combined resistance does not vary with temperature the ratio of the resistances of carbon and copper wires at `0^(@)C` is (Temperature coefficient of resistivity of copper and carbon respectively are `4xx(10^(-3))/(``^(@)C)` and `-0.5xx(10^(-3))/(``^(@)C)`

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At what temperature will the resistance of a copper wire become three times its value at 0^(@)C (Temperature coefficient of resistance for copper = 4 xx 10^(-3) per C)

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