Question

If potential difference across a conductor, having a material of specific resistance $\rho$ remains constant, then according to Joules law, heat developed in the conductor is directly proportional to :

• A. $\rho$
• B. $\rho^2$
• C. $\frac{1}{\sqrt{\rho}}$
• D. $\frac{1}{\rho}$

Answer 1

Answer: (D)

$\frac{1}{\rho}$

Answer 2

$R = \rho \, l / A$, and Q = $\frac{V^2}{R}$ , Hence $Q \propto \frac{1}{\phi}$