When the temperature of a conductor rises, its resistivity and conductivity undergo changes. The ratio of its resistivity to its conductivity

Step-by-step solution

The conductivity of a material is the reciprocal of its resistivity , so = 1 . The ratio of resistivity to conductivity is given by = 1/ = ^2 . For a conductor, the resistivity increases with an increase in temperature. Since increases, the square of the resistivity ^2 also increases. Therefore, the ratio of resistivity to conductivity increases as the temperature rises.