Two moles of helium gas are taken over the cycle $ABCD,$ as shown in the $P$-$T$ diagram. The work done on the gas in taking it from $D$ to $A$ is :

Question

Two moles of helium gas are taken over the cycle $ABCD,$ as shown in the $P$-$T$ diagram.

The work done on the gas in taking it from $D$ to $A$ is :

$+414$ $R$

$-690$ $R$

$+690$ $R$

$-414$ $R$

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