Question

An ideal gas is taken through the cycle A ® B ® C ® A as shown in figure. If the net heat supplied to the gas in the cycle is 5 J. The workdone by the gas in the process C ® A is –

• A. –5J
• B. –10J
• C. –15J
• D. –20 J

Answer 1

Answer: (A)

–5J

Answer 2

dw_ABCA = dQ_ABCA

$\frac{1}{2}$ (2–1) (10–P) = 5

5 – $\frac{P}{2}$ = 5 Ž P = 0

dw_CA = $- \frac{1}{2}$ [2 – 1] [0 + 10] = –5J