A) - 5 J
B) - 10 J
C) -15 J
D) -20 J
Correct Answer: A
Solution :
Work done by gas is given by \[W=P\Delta V\] Total work done by gas is \[W={{W}_{AB}}+{{W}_{BC}}+{{W}_{CA}}\] ... (i) From first law of thermodynamics \[\Delta Q=\Delta U+W\] ... (ii) Here \[{{W}_{AB}}=P\Delta V+10(2-1)=10\,\,J\] \[{{W}_{BC}}=P\Delta V=2\times 0=0\] Hence, Eqs. (i) and (ii) will be written as \[5=0+(10+0+{{W}_{CA}})\] \[\Rightarrow \] \[{{W}_{CA}}=-5\,\,J\]You need to login to perform this action.
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