Discussion Forum



1)

Six identical conducting rods are joined as shown in figure. Points A and D are maintained at 200°C and 20°C respectively. The temperature of junction B will be

1552021287_124954_8fac173b8fec4719b3d42a78f2bd5c35.png


A) 120°C

B) 100°C

C) 140°C

D) 80°C

Answer:

Option C

Explanation:

The equivalent electrical circuit of the arranganent is shown in figure.

1552021209_0nrqzzgx5xym-s.png

Temperature difference between the end points  A and D =  200 - 20 = 180°C

As the resistances for the three parts are equal, the temperature difference must be distributed equally in the three parts 

(180/ 3=60°C)

.'. Temperature of B = 200°C - 60°C = 140°C