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Two bodies are said to be in thermal equilibrium when which condition holds?
AThere is no net flow of thermal energy between them
BHeat flows steadily from one to the other
COne has greater mass than the other
DBoth are at zero kelvin
Answer & Solution
Correct answer: A. There is no net flow of thermal energy between them
1. Heat flows only when there is a temperature difference between bodies.
2. Thermal equilibrium means there is no net flow of thermal energy between them.
3. Equivalently, the two bodies are at the same temperature.
4. A steady flow of heat means a difference still exists, so that option is wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Thermal Equilibrium", p.40_
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