Two rods of same dimensions, but made of different materials are joined end to end with their free ends being maintained at 100ºC and 0ºC respectively. The temperature of the junction is 70ºC. Then the temperature of the junction if the rods are interchanged will be equal to T °C Find T:
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(30)
Heat current is same i H = 
= 
⇒ 
= 3/7
⇒ 
= 3/7
Heat current is same i H = 
= 
⇒ 
= 
= 
= 7/3
⇒ 300 – 3 T = 7T ⇒ T = 30°C
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