A system is taken through a cyclic process represented by a circle as shown in the figure. The heat absorbed by the system is

Options

A. `pi xx 10^3` J
B. `pi/2` J
C. `4pi xx10^2` J
D. `pi` J

Answer

B

Explanation

For cyclic process, `Delta U=0`
hence, `Delta Q=Delta W` = area under P-V curve
`implies Delta Q=pi/4 (P_2-P_1)(V_2-V_1)` [area of ellipse]
`implies Delta Q=pi/4 xx 100xx10^3 xx 20 xx 10^(-6)=pi/2 J`