InterviewSolution
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InterviewSolution
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A steel wire of length 20 cm and uniform cross-sectional `1 mm^(2)` is tied rigidly at both the ends. The temperature of the wire is altered from `40^(@)C` to `20^(@)C`. Coefficient of linear expansion of steel is `alpha = 1.1 xx 10^(-5) .^(@)C^(-1)` and Y for steel is `2.0 xx 10^(11) Nm^(2)`, the tension in the wire isA. `2.2 xx 10^(8) N`B. 16 NC. 8 ND. 44N |
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Answer» Correct Answer - d Increases in length due to rise in temperature `Delta L = a L Delta T` As,` Y = (FL)/(A Delta L)` so, `F = (YA Delta L)/(L) = (YA xx a L Delta T)/(L) = YA a Delta T` `:. F = 2 xx 10^(11) xx 10^(-6) xx 1.1 xx 10^(-5) xx 20 = 44N` |
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