One mole of an ideal diatomic gas undergoes a transition from $A$ to $B$ along a path $AB$ as shown in the figure. 

The change in internal energy of the gas during the transition is ............$\;kJ$

  • A$20$
  • B$-20$
  • C$0.02$
  • D$-12$
AIPMT 2015, Diffcult
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