Question

If the length of a conductor is halved, then the conductance will be:

• A. quadrupled
• B. doubled
• C. halved
• D. unchanged

Answer 1

Answer: (B)

Conductance of a conductor is reciprocal of its resistance,
$\text{Conductance}\text{=}\frac{\text{1}}{\text{resistance}}$
Since, resistance $=\frac{\rho l}{A}$
$\therefore$ $\text{Conductance}\propto \frac{\text{1}}{\text{length}\text{of}\text{conductor}}$
Thus, when length of a conductor is halved, then its conductance will be doubled.