Discussion Forum
Que.  The thermal resistance for heat conduction through a hollow sphere of inner radius r1 and outer radius r2 is 
a.  r₂ – r₁/4πk r₁r₂ 
b.  r₂ /4πk r₁r₂ 
c.  r₁/4πk r₁r₂ 
d.  4πk r₁r₂ 
Correct Answer:r₂ – r₁/4πk r₁r₂

Que.  The thermal resistance for heat conduction through a hollow sphere of inner radius r1 and outer radius r2 is 
a.  r₂ – r₁/4πk r₁r₂ 
b.  r₂ /4πk r₁r₂ 
c.  r₁/4πk r₁r₂ 
d.  4πk r₁r₂ 
Correct Answer:r₂ – r₁/4πk r₁r₂
