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Resistance of the wire is measured as 2 Ω and 3 Ω at 10°C and 30°C respectively. Temperature co-efficient of resistance of the material of the wire is:

1. 0.033°C –1
2. –0.033°C –1
3. 0.011°C –1
4. 0.055°C –1

Correct answer: 0.033°C –1

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