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 & Neglect linear expansion]

A copper disc and a carbon disc of same radius are assembled alternately and co-axially to make a cylindrical conductor whose temperature coefficient conductor whose temperature coefficient of resistance is almost equal to zero. Ratio of thickness of the copper and the carbon disc is (neglect change in length. alpha_(CU) and -alpha_(C) represent the temperature coefficients of resistivities and p_(cu) carbon at room temperature respectively)

A copper disc and a carbon disc of same radius are assembled alternately and co-axially to make a cylindrical conductor whose temperature coefficient conductor whose temperature coefficient of resistance is almost equal to zero. Ratio of thickness of the copper and the carbon disc is (neglect change in length. alpha_(CU) and -alpha_(C) represent the temperature coefficients of resistivities and p_(cu) carbon at room temperature respectively)

A thin ring and a solid disc of same mass and radius are rolling with the same linear velocity. Then ratio of their kinetic energies is

A thin ring and a solid disc of same mass and radius are rolling with the same linear velocity. Then ratio of their kinetic energies is

Two conductors have the same resistance at 0^@C but their temperature coefficient of resistanc are alpha_1 and alpha_2 . The respective temperature coefficients of their series and parallel combinations are nearly

Two conductors have the same resistance at 0^@C but their temperature coefficient of resistanc are alpha_1 and alpha_2 . The respective temperature coefficients of their series and parallel combinations are nearly

It was found that resistance of a cylindrical specimen of a wire does not change with small change in temperature. If its temperature coefficient of resistivity is alpha_(R) then find its thermal expansion coefficient (alpha) .

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)

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)