- #1
doppelganger007
- 18
- 0
Homework Statement
Suppose that the isotherms in a region are all concentric spheres centered at the origin. Prove that the energy flux vector field points either toward or away from the origin.
Homework Equations
J = - k (del)T
The Attempt at a Solution
so I know that -(del)T is perpendicular to the surface T, which is constant, but I'm not really sure how to finish off the proof from there...