Physics-
General
Easy
Question
The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from 
is 50 J and 20 cal heat is given to the system. The change in internal energy between A and C is
- 34 J
- 70 J
- 84 J
- 134 J
The correct answer is: 134 J
Heat given DQ 
.
Work done DW = – 50 J [As process is anticlockwise]
By first law of thermodynamics
Þ 
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