Question

The $P-V$ diagram of process on a system is shown in Fig. $19.33$. During the process, the work done by the system :

• A. increases continuously
• B. decreases continuously
• C. first increase, becomes maximum and then decreases
• D. first decreases, becomes minimum and then increase

Answer 1

The correct option is A increases continuously

Work done by a system in a process is equal to area under the curve in $P-r$ diagram

Let us consider three points on the curve $1,2,3$.

Area of $(1-2-2^{\prime }-1^{\prime })<$ Area of $(1-3-3^{\prime }-1^{\prime })$

As we move rightward the area under the curve is increasing, hence the work done is also increasing