In diagrams ( 1 to 4 ), variation of volume with changing pressure is shown. A gas is taken along the path ABCD. The change in internal energy of the gas will be
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a
Positive in all the cases (1) to (4)
b
Positive in cases (1),(2),(3) but zero in case (4)
c
Negative in cases (1),(2),(3) but zero in case (4)
d
zero in all the cases
answer is D.
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Detailed Solution
Internal energy is a state function hence in a cyclic process change in internal energy is zero.