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  4. In the reported figure, heat energy absorbed by a system in going through a cyclic process isπ J.

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Q. In the reported figure, heat energy absorbed by a system in going through a cyclic process is______$\pi J$.Physics Question Image

JEE MainJEE Main 2021Thermodynamics

Solution:

image
For complete cyclic process
$\Delta U=0 $
$\therefore $ from $\Delta Q=\Delta U+W$
$=0+W$
$\Delta Q=W $
$=$ Area
$=\pi r_{1} \cdot r_{2} $
$=\pi \times\left(10 \times 10^{3}\right) \times\left(10 \times 10^{-3}\right) $
$\Delta Q=100 \pi$