Two systems are said to be in thermal equilibrium if and only if :

Two systems are said to be in thermal equilibrium if and only if :

[amp_mcq option1=”there can be a heat flow between them even if they are at different temperatures” option2=”there cannot be a heat flow between them even if they are at different temperatures” option3=”there is no heat flow between them” option4=”their temperatures are slightly different” correct=”option3″]