Now take the same two charges along the $y-$axis from above and add a similar set$-$up along the $x-$axis. You now have

two finite line charge of $Q$; one distributed uniformly along the positive $y-$axis between $y=0$ and $y=L$ and the other

distributed uniformly along the positive $x-$axis between $x=0$ and $x=L.$ A positive point charge $q$ lies on the positive $x-$axis,

a distance $x=L+x_0$ from the origin and another positive point charge lies on the positive $y-$axis, a distance $y=L+y_0$ from the

origin. Find the electric field at the point $($L$,$L$).$