Let $\vec{F}=81 y \vec{i}+9 x \vec{j}$ And Let C_a Be the Circle of Radius a Centered

Short Answer

Let $\vec{F}=81 y \vec{i}+9 x \vec{j}$ and let C_a be the circle of radius a centered at the origin, traveled in a counter-clockwise direction.
Find $\lim _ { a \rightarrow 0 } \int _ { C _ { 0 } } \vec { F } \cdot d \vec { r }$