Question

When temperature of a conductor increases, its resistance

• A. increases
• B. decreases
• C. remains the same
• D. none of these

Answer 1

The correct option is A increases

As we know,
$R=\rho \frac{L}{A}$
Resistance depends on resistivity of the material and as we increase the temperature resistivity also increases.
$\rho$ is inversely proportional to the relaxation time of electrons .
As we increase the temperature the frequency of collision increases decreasing the relaxation time.