Question

What is the temperature coeefficient of resistance of a piece of wire having a resistance of 12. 85 ohm at 30 degrees celcius and 6.85 ohm at 0 degrees celcius. what will be its resistance?

Answer 1

$$R_2=R_1(1+\alpha(T_2-T_1))\\12.85=6.85(1+\alpha(30-0))\\ \alpha=0.0292\ K^{-1}$$