Answer:
0.44m/s
Explanation:
drift velocity=I/nAq
diameter 12 gauge
wire=0.081inches=0.081*2.5=0.2025cm radius=0.10125cm area=pi*R^2 =20/8.5*10^22*3.14*0.10125^2*10^-4*1.6*10^-19*
V = 0.44m/s
To solve this problem it is necessary to apply the concepts related to thermal linear expansion. Mathematically this concept can be expressed under the Equation:

Where,
Initial Length
Thermal Expanssion constant
Change in Lenght
Our values are given as



Replacing at our equation we have,



Therefore the expantion of the bar is 0.317mm
It might be c I'm not sure either. Hope I helped