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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

+15J

c

–10J

d

–20J

answer is A.

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Detailed Solution

q = +5J
W = WAB + WBC +WAC
    = -10(2-1) + 0 + WAC  

( WBC = 0  since it is at constant volume)
5 = -10+WAC
WAC =  +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