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

(a) there can be a heat flow between them even are at different temperatures
(b) there cannot be a heat flow between them even if they are at different temperatures
(c) there is no heat flow between them
(d) their temperature are slightly different

Anurag Mishra Professor Asked on 16th February 2016 in General Knowledge.
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    Answer: (c) there is no heat between them 

    Anurag Mishra Professor Answered on 16th February 2016.
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