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A coil of wire has a resistance of 25Ome...

A coil of wire has a resistance of `25Omega " at " 20^(@)C` and a resistance of `25.17 Omega` at `35^(@)C`. What is its temp coeff.

A

`3 xx 10^(-40) C^(-1)`

B

`8xx 10^(-70)C^(-1)`

C

`12 xx 10^(-40)C^(-1)`

D

`4.5 xx 10^(-40)C^(-1)`

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