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

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$20 J$

$30 J$

$- 30 J$

$- 60 J$

answer is B.

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Detailed Solution

$dU = 0 \Rightarrow dQ = dw$

$W_{C \to A} = 50 - 20 = 30 J$

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