A) $ 10^{7}\pi J $
B) $ 10^{4}\pi J $
C) $ 10^{2}\pi J $
D) $ {{10}^{-3}}\pi J $
Correct Answer: C
[c] As $ \Delta U=0 $ in a cyclic process,
$ AQ=AW=\text{area of circle}=\pi r^{2} $
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