Three rods $AB, BC$ and $AC$ having thermal resistances of $10\, units, \,10 \,units$ and $20 \,units,$ respectively, are connected as shown in the figure. Ends $A$ and $C$ are maintained at constant temperatures of $100^o C$ and $0^o C,$ respectively. The rate at which the heat is crossing junction $B$ is ........ $ \mathrm{units}$
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$\Rightarrow \mathrm{R}_{\mathrm{eq}}=20$
$\frac{\mathrm{d} \mathrm{H}}{\mathrm{dt}}=\frac{100}{20}=5 \mathrm{units}$
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