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The zeroth law says two systems in equilibrium with a third are:
AIn equilibrium
BIn excitation
CIn expansion
DIn extension
Answer & Solution
Correct answer: A. In equilibrium
1. The third system acts as a reference.
2. This gives the concept of temperature.
3. They are in thermal equilibrium with each other.
_Source: NCERT Class 11 Physics, Ch 11 'Thermodynamics'_
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