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A wire has a temperature coefficient of resistance of 0.00125 per degC. Its resistance is 1 ohm at 300 K. At what temperature will its resistance become 2 ohm?

1. 1154 K
2. 1100 K
3. 1400 K
4. 1127 K

Correct answer: 1127 K

Solution

With t1 = 27 degC, requiring R to double gives t2 = 854 degC = 1127 K.

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