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Heat and Thermodynamics question

2014 · Shift 0 · Q66

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JEE Main
Physics
Heat and Thermodynamics
2014 · Shift 0 · Q66

Heat and Thermodynamics question

2014 · Shift 0 · Q66

JEE MainPhysicsHeat and ThermodynamicsMCQ+4 / −1

Three rods of Copper, Brass and Steel are welded together to form a

Y

shaped structure. Area of cross - section of each rod

= 4c{m^2}.

End of copper rod is maintained at

{100^ \circ }C

where as ends of brass and steel are kept at

{0^ \circ }C

. Lengths of the copper, brass and steel rods are

46,13

and

12cms

respectively. The rods are thermally insulated from surroundings excepts at ends. Thermal conductivities of copper, brass and steel are

0.92, 0.26

and

0.12CGS

units respectively. Rate of heat flow through copper rod is:

A
$1.2cal/s$
B
$2.4cal/s$
C
$4.8cal/s$
D
$6.0cal/s$

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