Two moles of helium gas are taken over the cycle $ABCDA$, as shown in the $P-T$ diagram. Assuming the gas to be ideal the work done on the gas in taking it from $A $ to $B$ is ...... $R$
A$300$
B$400 $
C$600$
D$200$
AIEEE 2009, Medium
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B$400 $
b $A$ to $B$ is an isobaric process. The work done
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