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If the resistance of a conductor is 5 Ω at 50°C and 7 Ω at 100°C, then the mean temperature coefficient of resistance (of the material) is

1. 0.001/°C
2. 0.004/°C
3. 0.006/°C
4. 0.008/°C

Correct answer: 0.004/°C

Solution

The temperature coefficient of resistance is calculated by dividing the change in resistance by the product of initial resistance and temperature change.

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