A cylinder of radius R made of material of thermal conductivity K_1 is surrounded by a cylindrical shell of inner radius R and outer radius 3R made of material of thermal conductivity K_2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surfaceand the system is in steady state. The effective thermal conductivity of the system is

A cylinder of radius R made of material of thermal conductivity K_1 is

1.	A cylinder of radius R made of material of thermal conductivity K_1 is surrounded by a cylindrical shell of inner radius R and outer radius 3R made of material of thermal conductivity K_2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surfaceand the system is in steady state. The effective thermal conductivity of the system is
Answer» <html><body><p>`K_1 + K_2`<br/>`( K_2 K_1)/( K_1 + K_2)`<br/>`( 8K_1 + K_1)/( <a href="https://interviewquestions.tuteehub.com/tag/9-340408" style="font-weight:bold;" target="_blank" title="Click to know more about 9">9</a>)`<br/>`( K_1 + 8K_2)/(9)`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :D</body></html>