$(6)$ Two positive charges, each with charge $q=3\mathrm{.}5nC,$ are placed as shown in the diagram. The distance $d=0\mathrm{.}03m.$ We want to find the net electric potential at $x=0\mathrm{.}03m,y=0\mathrm{.}04m\mathrm{.}1nC=1\mathrm{.}0{10}^{-9}C.$

a$)(2)$ What is the distance between $q_1$ and $x=0\mathrm{.}03m,y=0\mathrm{.}04m?$

b$)(4)$ Find the net electric potential at the point $x=0\mathrm{.}03m,y=0\mathrm{.}04m.$