A nonuniform linear charge distribution given by $=$ bx$,$ where b is a constant, is located along an x axis from x $=0$ to x $=0\mathrm{.}26$ m$.$ Suppose that b $=72$ nC$/$m$2$ and V $=0$ at infinity.

$($a$)$ What is the electric potential at the origin?

V

$($b$)$ What is the electric potential at the point y $=0\mathrm{.}15$ m on the y axis?

V