A) will go on rising with time
B) will stop rising after sometime as it will loose heat to the surroundings by conduction
C) will rise for sometime and thereafter will start falling
D) will become constant after sometime because of loss of heat due to radiation
Correct Answer: D
Solution :
Temperature of electric heater will first increase in vacuum and after sometime thermal equilibrium is reached because there will be energy loss due to radiation (radiation is possible in vacuum).
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