Temperature difference of 120 o C is maintained between two ends of a uniform rod A B of length 2 L . Another bent rod P Q , of same cross-section as A B and length 3 L 2 , is connected across A B (See figure). In steady state, temperature

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Temperature difference of 120 o C is maintained between two ends of a uniform rod A B of length 2 L . Another bent rod P Q , of same cross-section as A B and length 3 L 2 , is connected across A B (See figure). In steady state, temperature difference between P and Q will be close to:

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Correct answer: A. 45 o C

T 1 - T 2 = 120 o C We define thermal resistance R = L K A Given circuit can be reduced to Equivalent resistance R e q = 8 R 5 Thermal current i = T 1 - T 2 8 R 5 T P - T Q = T 1 - T 2 8 R 5 &#160; 3 R 5 = 3 8 &#215; 120 = 45

Temperature difference of 120 o C is maintained between two ends of a uniform rod A B of length 2 L . Another bent rod P Q , of same cross-section as A B and length 3 L 2 , is connected across A B (See figure). In steady state, temperature difference between P and Q will be close to:

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