First slide

Conduction

Question

A cylindrical rod having temperatures T₁ and T₂ at its ends. The rate of flow of heat is Q₁ cal/sec. If all the dimensions are doubled keeping T₁ and T₂ constant, then rate of flow of heat Q₂ will be:

Easy

A

4Q₁
B

2Q₁
C

$\frac{Q_{1}}{4}$
D

$\frac{Q_{1}}{2}$

Solution

Rate of heat flow $= \frac{KA (T_{1} - T_{2})}{l} \infty \frac{r^{2}}{l}$

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