# At what temperature would the temperature of a copper conductor be double its value at $0^{\circ}C\: \alpha_{Cu} = 4 \times 10^{-3}$

$\begin {array} {1 1} (A)\;250^{\circ}C & \quad (B)\;200^{\circ}C \\ (C)\;150^{\circ}C & \quad (D)\;100^{\circ}C \end {array}$

$R = R_0(1 + \alpha \Delta \theta )$
Substitute $R = 2R_0$ to get the final answer
Ans : (A)
edited Mar 14, 2014