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Directions: Question are based on the following paragraph.

Two moles of helium gas are taken over the cycle ABCDA, as shown in the P-T diagram.

Question: Assuming the gas to be ideal the work done on the gas in taking it from A\; to\; B is

  • Option 1)

    200R

  • Option 2)

    300R

  • Option 3)

    400R

  • Option 4)

    500R

 

Answers (1)

As we learnt in

Reversible Isobaric Process -

W=P\left ( V_{f}-V_{i} \right )
 

- wherein

P_{gas}= constant

Since pressure of gas is defined during whole of the process and hence the process must be reversible

 

 WAB = P.\DeltaV= n R\DeltaT = 2 \times (500-300) R = 400 R 

 


Option 1)

200R

This option is incorrect.

Option 2)

300R

This option is incorrect.

Option 3)

400R

This option is correct.

Option 4)

500R

This option is incorrect.

Posted by

Vakul

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