A) quadrupled
B) doubled
C) halved
D) unchanged
Correct Answer: B
Solution :
Key Idea: Conductance of a conductor is reciprocal of its resistance. Conductance \[=\frac{1}{resistance}\] Since, resistance \[=\frac{\rho l}{A}\] \[\therefore \] Conductance \[\propto \frac{1}{length\text{ }of\text{ }conductor}\] Thus, when length of a conductor is halved, then its conductance will be doubled.
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