Combination of plots NOT representing isothermal expansion of ideal gas:

Question

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Strategy:
 For an isothermal expansion of an ideal gas: (1) , (2) , (3)  (meaning  vs  is a flat horizontal line).

Step 1: Evaluate the plots
- (A) P vs V: Correct hyperbolic curve.
- (B) PV vs V: Should be a horizontal line. Plot B is incorrect.
- (C) P vs 1/V: Correct linear plot starting from origin.
- (D) U vs V: Internal energy remains constant at constant ; should be horizontal. Plot D is incorrect.

Step 2: Conclusion
The combination (B) and (D) does not represent the process correctly.

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