MCQ
The work done by the external forces on a system equals the change in:
- ATotal energy.
- BKinetic energy.
- CPotential energy.
- DNone of these.
Explanation:
When work is done by an external forces on a system, the total energy of the system will change.
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$A \rightarrow B :$ Isothermal expansion at temperature $T$ so that the volume is doubled from $V _{1}$ to $V _{2}=2 V _{1}$ and pressure changes from $P _{1}$ to $P _{2}$
$B \rightarrow C :$ Isobaric compression at pressure $P _{2}$ to initial volume $V _{1}$
$C \rightarrow A$ : Isochoric change leading to change of pressure from $P _{2}$ to $P _{1}$
Total workdone in the complete cycle $ABCA$ is