Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to__________________?
Correct answer: B. r1. r2/(r2 - r1)
- A. (r2 - r1)/r1. r2
- B. r1. r2/(r2 - r1)
- C. (r2 + r1)/r1. r2
- D. r1. r2/(r2 + r1)
Explanation
For steady radial conduction through a hollow sphere, heat flow is proportional to the spherical conductance factor r1r2/(r2 − r1). The constant 4πk and temperature difference are omitted from the options, leaving option b.
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