InterviewSolution
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InterviewSolution
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The temperature coefficient of resistance of a wire is 0.00125 per `.^oC`. At 300K, its resistance is 1 `Omega`. The resistance of the wire will be 2 `Omega` at |
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Answer» Correct Answer - `1127 K` Here `alpha = 0.00125^(@)C^(-1)` `t_(1) = 300 K= 300 - 273 = 27^(@)C` `R_(27) = R_(0) (1 + alpha xx 27)` and `R_(t) = R_(0) ( 1+alpha xx t)` or `1 = R_(0) (1+ alpha xx 27) and 2 = R_(0) (1+ alpha t)` `:. (2)/(1) (1+alpha t)/(1+alpha xx 27) or 1+ alpha t = 2+ 54 alpha` or `t = (1+ 54 alpha)/(alpha) = (1+ 54 xx 0.00125)/(0.00125) = 854 ^(@)C` `= 854 + 273 = 1127 K` |
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