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Physics · 2014
JEE Main 2014 · 2014-04-06 Offline · Q11
Three rods of Copper, Brass and Steel are welded together to form a Y - shaped structure. Area of cross - section of each rod =4 cm^2. End of copper…
Three rods of Copper, Brass and Steel are welded together to form a Y - shaped structure. Area of cross - section of each $\displaystyle \mathrm{rod}=4 \mathrm{~cm}^2$. End of copper rod is maintained at $\displaystyle 100$°C where as ends of brass and steel are kept at $\displaystyle 0$°C. Lengths of the copper, brass and steel rods are $\displaystyle 46$, $\displaystyle 13$ and $\displaystyle 12$ cms respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are $\displaystyle 0.92$, $\displaystyle 0.26$ and $\displaystyle 0.12$ CGS units respectively. Rate of heat flow through copper rod is :
Official answer
(3)
$\displaystyle 4.8 \mathrm{cal} / \mathrm{s}$
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