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Priyanshu kumar Best Answer
Dear Sourav, when change in internal Energy=0 then q=-W then here two cases arises... 1st case If q is positive then w is negative ..This means that net heat absorbed by the system is equal to net work done by the system .. 2nd case If q is negative then w is positive ...This means that heat releases from the system is equal to net work done on the system.... In this way you can understand this sourav