Question

Specific resistance of all metals is mostly affected by

• A. volume
• B. pressure
• C. temperature
• D. magnetic field

Answer 1

The correct option is C temperature

Specific resistance of metal at temperature $T$, ${\rho }_T={\rho }_o(1+\alpha \Delta T)$

Specific resistance of metal depends on the temperature of the metal and it increases with increase in temperature. Also specific resistance of metals does not vary with volume of substance, pressure and applied magnetic field.