A magnetic field line indicates MCQ with Answer and Explanation
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A wire of resistance 10 Ω is stretched to double its length. Its new resistance is
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LED works on the principle of
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Linear expansion coefficient α = 2×10⁻⁵/°C. Length increase for 1 m rod heated 50°C:
Correct Answer: Option B
Explanation:
ΔL = L₀αΔT = 1×2×10⁻⁵×50 = 100×10⁻⁵ = 10⁻³ m = 1 mm. Direct expansion formula application. Memory tip: 'ΔL = LαΔT; convert result to required units'. Tests thermal expansion calculation with unit conversion, frequently appearing in competitive exams.
ΔL = L₀αΔT = 1×2×10⁻⁵×50 = 100×10⁻⁵ = 10⁻³ m = 1 mm. Direct expansion formula application. Memory tip: 'ΔL = LαΔT; convert result to required units'. Tests thermal expansion calculation with unit conversion, frequently appearing in competitive exams.
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