The three rods shown in figure have identical geometrical dimensions.

Question:

The three rods shown in figure have identical geometrical dimensions. Heat flows from the hot end at a rate of $40 \mathrm{~W}$ in the arrangement

(a). Find the rates of heat flow when the rods are joined as in arrangement

(b) and in

(c). Thermal conductivities of aluminium and copper are $200 \mathrm{~W} / \mathrm{m}-{ }^{\circ} \mathrm{C}$ and $400 \mathrm{~W} / \mathrm{m}-{ }^{\circ} \mathrm{C}$ respectively.

Solution:

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