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Q.

An electric heater kept in a vacuum is heated continuously by passing electric current. Its temperature

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a

Will rise for sometime and there after will start falling

b

Will stop after sometime as it will loose heat to the surroundings by conduction

c

It will become constant after some time because of loss of heat due to radiation

d

Will go on rising with time

answer is D.

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Detailed Solution

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  • The heater's temperature rises after introducing a voltage while initially treating there to be no radiation.
  • Radiation grows in proportion to temperature.
  • The output power ought to be constant because the input power is constant.
  • Radiation and temperature will both be rising initially.
  • When the heater reaches a specific temperature, the input power and radiation power are equal, and the heater's temperature stops rising.
  • After some time, the temperature becomes consistent.
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An electric heater kept in a vacuum is heated continuously by passing electric current. Its temperature