A Heat-Conducting Rod,0

Multiple Choice

A heat-conducting rod,0.90 m long and wrapped in insulation,is made of an aluminum section that is 0.20 m long and a copper section that is
Long.Both sections have a cross-sectional area of
The aluminum end and the copper end are maintained at temperatures of
And
Respectively.The thermal conductivities of aluminum and copper are 205 W/m ∙ K (aluminum) and 385 W/m ∙ K (copper) .What is the temperature of the aluminum-copper junction in the rod with steady state heat flow?

A) 100°C
B) 93°C
C) 86°C
D) 80°C
E) 74°C