The piston is massless and the spring is ideal and initially stretched. The piston cylinder arrangement encloses an ideal gas. If the gas is heated quasistatically, the PV graph is :-

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TestHub · Accepted Answer

At quasistatic equilibrium, the spring force changes with displacement x:

$P = P_{0} + \frac{k x}{A}$

The piston displacement changes the gas volume:

$V = V_{0} + A x$

Eliminate x:

$P = P_{0} + \frac{k}{A ^{2}} (V - V_{0})$

Pressure therefore rises linearly with volume. Answer B.

Physics - Heat & Thermo Question with Solution | TestHub

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