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

An ideal gas is taken through the cycle A rarr B rarr C rarr A, as sho

1.	An ideal gas is taken through the cycle A rarr B rarr C rarr A, as shown in figure. If the net heat supplied to the gas in the cycle is 5J, the work done by the gas in the process C rarr A is
Answer» `-5 J` `-10 J` `-15 J` `-20 J` Solution :Process `A rarr B` occurs at CONSTANT PRESSURE, `:. W_(AB) = PDELTA V = P(V_(2) - V_(1))` `= 10 XX (2-1) = 10 J` Process `B rarr C`, occurs at constant volume, `:. W_(BC) = 0` For a cyclic process, `Delta Q = W` `:. Delta Q = W_(AB) + W_(BC) + W_(CA)` or `5 = 10 + 0 + W_(CA)` or `W_(CA) = - 5J`