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A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure. It absorbs, 40 J of heat during the part AB, no heat during BC and rejects 60 J of heat during CA. A work of 50 J is done on the as during the part BC. The internal energy of the gas at A is 1560 J. The work done by the gas during the part CA is:

1. 20 J
2. 30 J
3. –30 J
4. –60 J

Correct answer: 30 J

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