Carnot cycle is plotted in $P-V$ graph. Which portion represents an isothermal expansion?
A$A B$
B$B C$
C$C D$
D$D A$
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A$A B$
a (a)
$A B$ is isothermal expansion. $B C$ is adiabatic expansion $C D$ is isothermal compression $\Delta A=$ adiabatic compression.
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