The temperature coefficient of resistance of a wire is 0.00125 per `^@C` At 300 K. its resistance is`1Omega` The resistance of this wire will be `2Omega` at :

Explanation

`alpha = 0.00125^@ C, t_1 = 300 K,R_1 =1 Omega`
`R_2 = 2Omega, t_2=?`
Temperature coefficient resistance
`alpha =(R_2 -R_1)/(R_ (t_2 -t_1)) , 0.00125 = (2-1)/(1(t_2 - 300))`
`t_2-300 =1/(0.00125)`
`t_2 =300 +(10^3)/(1.25) = 300 + 800 = 1100 K`
Final temperature `t_2 = 1100 K`