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Q.

An ideal gas is taken through the cycle A→B→C→A as shown in figure. If net heat supplied to the gas in the cycle is 5J, the work done by the gas in the process C→A is

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a

+15J

b

–10J

c

–15J

d

–20J

answer is A.

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Detailed Solution

q = +5JW = WAB + WBC +WAC    = -10(2-1) + 0 + WAC  ( WBC = 0  since it is at constant volume)5 = -10+WACWAC =  +5+10 = +15J
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An ideal gas is taken through the cycle A→B→C→A as shown in figure. If net heat supplied to the gas in the cycle is 5J, the work done by the gas in the process C→A is