Verified Solution • 2025–26 Session moderate

QJEEM25Pha307: JEE Main 2025 Physics - Class 11 JEEM25Pha307 Solution: Using the given diagram, the work done by an ideal gas along…

JEE Main 2025 (Online) 23rd January Evening Shift Physics - Heat and Thermodynamics Question 9 English

Using the given P−VP-V diagram, the work done by an ideal gas along the path ABCDA B C D is :

Multiple Choice Options

  • A 3P0 V03 \mathrm{P}_0 \mathrm{~V}_0
  • B −3P0 V0-3 \mathrm{P}_0 \mathrm{~V}_0
  • C −4P0 V0-4 \mathrm{P}_0 \mathrm{~V}_0
  • D 4P0 V04 \mathrm{P}_0 \mathrm{~V}_0

Step-by-Step Verified Solution

To find the work done by an ideal gas along the path ABCDABCD on the given P−VP-V diagram, we calculate the work done on each segment individually and then sum them up.

Segment ABAB : The work is given by wAB=P0×V0\text{w}_{AB} = P_0 \times V_0 , contributing P0V0P_0 V_0 .

Segment BCBC : No volume change occurs along this path, resulting in zero work: wBC=0\text{w}_{BC} = 0 .

Segment CDCD : The gas compresses, performing negative work: wCD=−(2P0×2V0)=−4P0V0\text{w}_{CD} = -(2P_0 \times 2V_0) = -4P_0 V_0 .

Adding the work done in each segment:

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margin-left: -0.186em;"><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-script></mjx-msub><mjx-tstrut></mjx-tstrut></mjx-mtd></mjx-mtr></mjx-itable></mjx-table></mjx-mtable></mjx-math><mjx-assistive-mml unselectable="on" display="block"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mtable displaystyle="true" columnalign="right left" columnspacing="0em" rowspacing="3pt"><mtr><mtd><msub><mtext>w</mtext><mrow data-mjx-texclass="ORD"><mi>A</mi><mi>B</mi><mi>C</mi><mi>D</mi></mrow></msub></mtd><mtd><mi></mi><mo>=</mo><msub><mtext>w</mtext><mrow data-mjx-texclass="ORD"><mi>A</mi><mi>B</mi></mrow></msub><mo>+</mo><msub><mtext>w</mtext><mrow data-mjx-texclass="ORD"><mi>B</mi><mi>C</mi></mrow></msub><mo>+</mo><msub><mtext>w</mtext><mrow data-mjx-texclass="ORD"><mi>C</mi><mi>D</mi></mrow></msub></mtd></mtr><mtr><mtd></mtd><mtd><mi></mi><mo>=</mo><msub><mi>P</mi><mn>0</mn></msub><msub><mi>V</mi><mn>0</mn></msub><mo>+</mo><mn>0</mn><mo>−</mo><mn>4</mn><msub><mi>P</mi><mn>0</mn></msub><msub><mi>V</mi><mn>0</mn></msub></mtd></mtr><mtr><mtd></mtd><mtd><mi></mi><mo>=</mo><mo>−</mo><mn>3</mn><msub><mi>P</mi><mn>0</mn></msub><msub><mi>V</mi><mn>0</mn></msub></mtd></mtr></mtable></math></mjx-assistive-mml></mjx-container></mjx-assistive-mml></mjx-container></mjx-assistive-mml></mjx-container>

Thus, the total work done by the gas along the path ABCDABCD is −3P0V0-3P_0 V_0 .

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