A tungsten filament at 20°C has

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Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

A tungsten filament at 20°C has a resistance of 0.350 Ω. What would the resistance be if the temperature is increased to 2850°C?

given α = 4.5 X 10^-3/°C

Options:

3.5Ω

4.8Ω

5.6Ω

8.7 Ω

Correct Answer:

4.8Ω

Explanation:

\(\alpha\) = \(\frac{R-R_{o}}{\theta R_{o}}\)