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BITSAT2024PhysicsThermodynamicsActual

A gas can be taken from A to B via two different processes A C B and A D B . When path A C B is used 60 J of heat flows into the system and 30J of work is done by the system. If path ADB is used work done by the system is 10 J . The heat Flow into the system in path ADB is :

Options

  1. A40 J
  2. B80 J
  3. C100 J
  4. D20 J

Correct answer

A. 40 J

Step-by-step solution

U remains same for both paths ACB and ADB Q_ A C B = W_ A C B + U_ A C B 60 ~J =30 ~J + U _ ACB U _ ACB =30 ~J As change in internal energy depends only on initial and final point U _ ADB = U _ ACB =30 ~J Q _ ADB = U _ ADB + W _ ADB =10 ~J +30 ~J =40 ~J

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