Resistivity of a typical metallic conductor as temperature increases:
ADecreases
BStays constant
CIncreases
DBecomes zero
Answer & Solution
Correct answer: C. Increases
1. In metals, ρ ≈ ρ₀ [1 + α(T − T₀)]; α positive.
2. Higher T means more phonon scattering of conduction electrons.
3. So ρ increases with T (opposite to semiconductors, which decrease).
_Source: NCERT Class 12 Physics Ch 3 §3.7 Temperature Dependence_
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