NEET2023Physics-Electricity
NEET 2023 Physics Resistance MCQ Question
Type: MCQ-numerical-Medium-Class 12
The resistance of platinum wire at 0°C is 2Ω and 6.8Ω at 80°C. The temperature coefficient of resistance of the wire is:
A
3×10⁻³ °C⁻¹
B
3×10⁻² °C⁻¹
C
3×10⁻¹ °C⁻¹
D
3×10⁻⁴ °C⁻¹
Correct Answer
Option A
Detailed Explanation
Using the formula R = R0(1 + αT), where R0 = 2Ω, R = 6.8Ω, and T = 80°C, solve for α to find α = 3×10^−3 °C^−1.
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