An enclosed one mole of a monoatomic gas is taken through a process $A$ to $B$ as shown in figure. The molar heat capacity of the gas for this process is
A$R$
B$2R$
C$3R$
D$4R$
Medium
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B$2R$
b $\mathrm{C}=\mathrm{C}_{\mathrm{v}}+\frac{\mathrm{R}}{1-\mathrm{n}}$
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