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Question

Three rods of a same material same area of cross-section but different lengths 10 cm, 20 cm, and 30 cm are connected at a point as shown. What is a temperature of junction O?
1039086_0f7a7f2efba645eeb105001a46abb508.png

A
19.2
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B
16.4
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C
11.5
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D
22
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Solution

The correct option is A 19.2
Let the temperature at point 0 be T0
so,
TATOl1=TOTBl2+TOTCl3

30TO30=TO1010+TO2020

Solving this
TO=19.2

960238_1039086_ans_866bf3aaa2c34bdaaf5a86a132e413d5.png

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