The resistance of platinum wire at 0 C is 2 and 6.8 at 80 C . The temperature coefficient of resistance of the wire is

1. A. 3 10 -4 C -1
2. B. 3 10 -3 C -1
3. C. 3 10 -2 C -1
4. D. 3 10 -1 C -1

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