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Q.

The pressure of a gas changes linearly with volume A to B as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be

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a

0 

b

4.5J 

c

6J

d

-4.5J

answer is B.

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Detailed Solution

Work = area under p-v curve =−4.5J
   ΔU=−Δw=4.5J

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