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(A) The internal energy of an ideal gas is a state function,which depends only on the temperature of the system.For any cyclic process,the system retu

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(A) The internal energy of an ideal gas is a state function,which depends only on the temperature of the system.For any cyclic process,the system returns to its initial state,meaning the final temperature is equal to the initial temperature $(T_f = T_i)$.Since the change in internal energy $\Delta U$ is given by $\Delta U = n C_v \Delta T$,and for a complete cycle $\Delta T = 0$,it follows that $\Delta U = 0$ for the entire cycle $A 	o B 	o C 	o A$.

An ideal gas is taken through the cycle $A \to B \to C \to A,$ as shown in the figure. What is the change in internal energy in $J$?

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