A brass disc and a carbon disc of same radius are assembled alternatively to make a cylindrical conductor. The resistance of the cylinder is independent of the temperature. The ratio of thickness of the brass disc to that of the carbon disc is[αB and αC are respectively the temperature coefficients of resistance of brass and carbon & ρB and ρC are respectively the resistivities of brass and carbon. Neglect linear expansion]

A brass disc and a carbon disc of same radius are assembled alternativ

1.	A brass disc and a carbon disc of same radius are assembled alternatively to make a cylindrical conductor. The resistance of the cylinder is independent of the temperature. The ratio of thickness of the brass disc to that of the carbon disc is[αB and αC are respectively the temperature coefficients of resistance of brass and carbon & ρB and ρC are respectively the resistivities of brass and carbon. Neglect linear expansion]
Answer» A brass disc and a carbon disc of same radius are assembled alternatively to make a cylindrical conductor. The resistance of the cylinder is independent of the temperature. The ratio of thickness of the brass disc to that of the carbon disc is [ $α_{B}$ and $α_{C}$ are respectively the temperature coefficients of resistance of brass and carbon & $ρ_{B}$ and $ρ_{C}$ are respectively the resistivities of brass and carbon. Neglect linear expansion]

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