What is the nature of change in internal energy in the following three thermodynamical processes shown in figure
  • A$\Delta U$ is positive in all the three cases
  • B$\Delta U$ is negative in all the three cases
  • C$\Delta U$ is $+$ for $(a)$, $-$ for $(b)$, zero for $(c)$
  • D$\Delta U = 0$, in all the cases
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