Three rods of Copper, Brass and Steel are welded together to form a … shaped structure. Area of cross - section of each rod … End of copper rod is maintained at … where as ends of brass and steel are kept at …. Lengths of the copper, brass and steel rods are … … and … … respectively. The rods are thermally insulated from surroundings excepts at ends. Thermal conductivities of copper, brass and steel are … and … … units respectively. Rate of heat flow through copper rod is:

Option C. Rate of heat flow is given by,

Heat and Thermodynamics

JEE Main 2014 · Session, Shift 1 · Q7340

PhysicsHard251×since 2002Q7340

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

12

cms

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

0.92, 0.26

and

0.12

CGS

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

Heat and Thermodynamics — JEE Main 2014 · Session, Shift 1 · Q7340 · Alror