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What is the percentage change in length of 4m iron rod if its temperature changes by 200°C.(a iron = 2 x 10^-5/°C)O 0.2%O 0.4%O 0.6%O 0.5% |
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Answer» We have to find the percentage change in length of 4m iron rod if its TEMPERATURE changes by 200°C. coefficient of iron is 2 × 10¯⁵/°C. solution : change in length is given by, ∆L = L₀α∆T ⇒fractional change = ∆L/L₀ = α∆T ⇒percentage change = ∆L/L₀ × 100 = 100α∆T here α = 2 × 10¯⁵/°C and ∆T = 200°C so, percentage change in length of iron rod = 100 × 2 × 10¯⁵ × 200 = 4 × 10⁴ × 10¯⁵ = 0.4 % Therefore the correct option is (B) 0.4 % ALSO read similar questions : Why a brown coating is formed on the iron rod when iron rod is kept dipped in copper sulphate solution for sometime? Wha... An iron rod of lenght 30cm is heated through 50 kelvin CALCULATE its increase in lenght (LINEAR expansivity of iron=1.2 ... |
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