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Question

In which of the following cases is thermal equilibrium achieved?

A
One body is at 45-degree Celcius and other at 35-degree Celcius
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B
One body is at 75-degree Celcius and other at 100-degree Celcius
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C
Both the bodies are at 55-degree Celcius
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D
One body is at 0 degree Celcius and other at -5 degree Celcius
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Solution

The correct option is C Both the bodies are at 55-degree Celcius
Thermal equilibrium is achieved when there is no heat flow between two bodies when they are connected by a path permeable to heat. This is the zeroeth law of thermodynamics. When two bodies are at the same temperature, heat flow does not takes place and they are said to be in thermal equilibrium.

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