A system changes from the state $({P_1},\;{V_1})$ to $({P_2},{V_2})$ as shown in the figure. What is the work done by the system
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(c) Work done = Area of $PV$ graph (here trapezium)
$ = \frac{1}{2}(1 \times {10^5} + 5 \times {10^5}) \times (5 - 1) = 12 \times {10^5}J$
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