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$A$ 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 [$\alpha$ is temperature coefficient of resistance and Neglect linear expansion ]
  • A$\left| {\frac{{{\alpha _C}{\rho _C}}}{{{\alpha _B}{\rho _B}}}} \right|$
  • B$\left| {\frac{{{\alpha _C}{\rho _B}}}{{{\alpha _B}{\rho _C}}}} \right|$
  • C$\left| {\frac{{{\alpha _B}{\rho _C}}}{{{\alpha _C}{\rho _B}}}} \right|$
  • D$\left| {\frac{{{\alpha _B}{\rho _B}}}{{{\alpha _C}{\rho _C}}}} \right|$
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