Figure shows the variation of the internal energy \( U \) with density \( \rho \) of one mole of...

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Figure shows the variation of the internal energy \( U \) with density \( \rho \) of one mole of an ideal monatomic gas for thermodynamic cycle \( A B C A \). Here process \( A B \) is a part of rectangular hyperbola:
(a) Process \( A B \) is isothermal and net work in cycle is done by gas.
(b) Process \( A B \) is isobaric and net work in cycle is done by gas
(c) Process \( A B \) is isobaric and net work in cycle is done on the gas
(d) Process \( A B \) is adiabatic and net work in cycle is done by gas
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