Question

Resistance of the wire is measured as 2 Ω and 3 Ω at 10°C and 30°C respectively. Temperature co-efficient of resistance of the material of the wire is:

• A. 0.033°C–1
• B. –0.033°C–1
• C. 0.011°C–1
• D. 0.055°C–1

Answer 1

Answer: (A)

0.033°C–1

Answer 2

The correct answer is (A) : 0.033°C–1
R10 = 2 = R0(1 + α × 10)
R30 = 3 = R0(1 + α × 30)
On solving
α = 0.033/°C