The temperature of a room heated by a heater is 2 0 ∘ C when the outside temperature is − 2 0 ∘ C, and it is 1 0 ∘ C when the outside temperature is − 4 0 ∘ C. The temperature of the heater is:

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In steady state, heat from the heater = heat lost. k ( T h ​ − 20 ) = c ( 20 + 20 ) and k ( T h ​ − 10 ) = c ( 10 + 40 ) . Dividing, T h ​ − 10 T h ​ − 20 ​ = 50 40 ​ , so T h ​ = 6 0 ∘ C. D.

Physics - Heat & Thermo Question with Solution | TestHub

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