STANDARDPhysics-Current Electricity
STANDARD Physics Temperature Coefficient of Resistance MCQ Question
Type: MCQ-numerical-Medium-Class 12
A wire has a resistance of 2.5 Ω at 28°C and a resistance of 2.9 Ω at 100°C. The temperature coefficient of resistivity of material of the wire is
A
1.06 × 10⁻³ °C⁻¹
B
3.5 × 10⁻² °C⁻¹
C
2.22 × 10⁻³ °C⁻¹
D
3.95 × 10⁻² °C⁻¹
Correct Answer
Option C
Detailed Explanation
Using the formula R₂ = R₁[1 + α(T₂ - T₁)], we find α = 2.22 × 10⁻³ °C⁻¹ by substituting the given resistances and temperatures.
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