A room is maintained at 20 
by a heater of resistance 20 ohm connected to 200 volt mains. The temperature is uniform through out the room and heat is transmitted through a glass window of area 1 m 2 and thickness 0.2 cm. What will be the temperature outside? Given that thermal conductivity K for glass is 0.2 cal/m × × 
× × sec and J = 4.2 J/cal
Text Solution
Verified by ExpertsA
As the temperature of room remain constant therefore the rate of heat generation from the heater should be equal to the rate of flow of heat through a glass window
⇒ ⇒ 
⇒ ⇒ θ θ = 15.24 o C
[where θ θ = temperature of outside]
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