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Question:

An ideal gas is taken through the cycle A→B→C→A, as shown in the figure. If the net heat supplied to the gas in the cycle is 55 J, the work done by the gas in the process C→A is?

-15 J

-5 J

-10 J

-20 J

Solution:

Work done in cyclic process is area under the curve = 10J
5 = WCA + 10
WCA = 5 -10 = -5 J