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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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