A ring consisting of two parts 
and 
of same conductivity 
carries an amount of heat 
. The 
part is now replaced with another metal keeping the temperatures 
and 
constant. The heat carried increases to 
. What should be the conductivity of the new 
part?
(Take, 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Heat carried increases to 2 times. Therefore, new net thermal resistance will become half.
Solving this, we get 
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