Question bank/JEE Main/Physics
JEE MainPhysics
Four metal rods all of identical dimensions and made of same
material are welded together at a single point. The configuration is
such that any two rods are oriented at 120°. The far ends of three of
the rods are maintained at 90°C temperature and that of the fourth rod
is maintained at 30°C temperature. The temperature of the junction point
is ( in degree Celsius)
Show answer and solution
For equilibrium condition, heat flow in and out of junction
should be same. Let k represent some constant representing heat content,
which may depend on dimensions and material of the rods.
k(T - 30) = 3k(90 - T)
4T = 300
T = 75°C
should be same. Let k represent some constant representing heat content,
which may depend on dimensions and material of the rods.
k(T - 30) = 3k(90 - T)
4T = 300
T = 75°C
Source: Grass-G / P-01 Physics Paper-01_Update.docx
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