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The three processes in a thermodynamic c...

The three processes in a thermodynamic cycle shown in the figure are : Process 1 `to` 2 is isothermal, Process 2 `to` 3 is isochoric (volume remains constant), Process 3 `to` 1 is adiabatic. The total work done by the ideal gas in this cycle is 10 J. The internal energy decreases by 20 J in the isochoric process. The work done by the gas in the adiabatic process is -20 J. The heat added to the system in the isothermal process is

A

0J

B

10J

C

20J

D

30J

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaQ_(1 to 2) = Delta w_(12)`
`w_("Total") = Delta w_(12) + Delta w_(31)`
` 10 = Delta w_(12) -20`
` DeltaQ_(12) = Delta w_(12) = 30J`
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