\(\Delta U=0\)
\(\therefore \text { from } \Delta Q=\Delta U+W\)
\(=0+W\)
\(\Delta Q=W\)
\(=\text { Area }\)
\(=\pi r_{1} \cdot r_{2}\)
\(=\pi \times\left(10 \times 10^{3}\right)\left(10 \times 10^{-3}\right)\)
\(\Delta Q=100 \pi\)
\(\therefore \text { Ans. }=100\)