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A carbon filament has a resistance of 10...

A carbon filament has a resistance of `100 Omega " at " 0^(@)C`. What must be the resistance of a copper filament placed in series with carbon so that the combination has the same resistance at all temperatures ? Temperature coefficient of resistance of carbon `=-0.0007 .^(@)C^(-1)` and that of copper is `0.004^(@)C^(-1)`.

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