If the temperature of a metallic conductor is increased, then the product of resistivity and conductivity
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → remains same
For a conductor:
Resistivity: $\rho$
Conductivity: $\sigma = \frac{1}{\rho}$
Product: $\rho \cdot \sigma = \rho \cdot \frac{1}{\rho} = 1$
This is independent of temperature.
${\text{remains same}}$