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1. A copper wire is stretched so that its length is increased by 0.91%. What is the percentage change in its resistance? 2. A coil

1. A copper wire is stretched so that its length is increased by 0.91%. What is the percentage change in its resistance?

2. A coil has a resistance of 23 when its mean temperature is 20C and of 20 when its mean temperature is 80C. Find its mean temperature rise when its resistance is 17 and the surrounding temperature is 25C.

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