A) quadrupled
B) doubled
C) halved
D) unchanged
Correct Answer: B
Solution :
Key Idea : 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.
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