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Thermal Expansion

The energy su...

Question

The energy supply being cut-off, an electric heater element cools down to the temperature of its surroundings, but it will not cool further because

A

Supply is cut off

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B

It is made of metal

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C

Surroundings are radiating

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D

Element & surroundings have same temp

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Solution

The correct option is D
Element & surroundings have same temp

When element and surrounding have same temperature. There will be no temperature difference, hence heat will not flow from the filament and it's temperature remains constant.

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