Question

The heat energy absorbed by a system in going through a cyclic process shown in figure is

• A. ${10}^3\pi J$
• B. ${10}^2\pi J$
• C. ${10}^4\pi J$
• D. ${10}^7\pi J$

Answer 1

The correct option is B ${10}^2\pi J$

Since process is cyclic, change in internal energy $\Delta U=0$
Applying first law of thermodynamics,
$\Delta Q=\Delta U+\Delta W$
$\Delta Q=\Delta W$ = Area under the ellipse= $\pi ab$
Here, length of semi major axis=a=10=b=length of semi minor axis
Hence, heat absorbed= ${10}^2\pi J$