As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity _______________ .

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increases Resistivity (ρ) of a conductor is the reciprocal of the its conductivity(σ). Thus, \rho = 1/\sigma The ratio of the resistivity and the conductivity, \rho/\sigma = \rho/1/\rho = \rho^2 As resistivity increases with temperature, the square of resistivity will also increase. Hence, the ratio of resistivity and conductivity will increase with increase in temperature.

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