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For the given cycle (A at $3\times10^2\ N/m^2$, B at $3\times10^2\ N/m^2$ with $V=3\ m^3$, C at $10^2\ N/m^2$ with $V=1\ m^3$, on a P-V diagram), the work done during isobaric process is: [add image]
A
200 J
B
Zero
C
400 J
D
600 J
Detailed Solution
AB is the isobaric process (constant pressure $3\times10^2\ N/m^2$, volume changing from 1 to 3 $m^3$). $W_{AB}=P(V_2-V_1)=3\times10^2\times(3-1)=3\times100\times2=600$ J.