Pls ans it fast.
Dear Student ,
From first law of thermodynamics,
dQ + dW = dU (Note the I have taken the work done by the surrounding which is negative of the work done by the system, dQ is heat supplied to the system dU is the change in the internal energy of the system.)
dU is a point function
so it's integral over a cyclical path always be zero as you will reach the same point that you started with.
so ΔU = Zero
Therefore the cyclical integral of dQ + dW will be zero.
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