Advanced physics

9. A line charge of length & and oriented along the x axis as show below has a charge per unit length 2, which varies with x as A=2.(x - a)/a, where a is the distance of the rod from the origin and 20 is a constant. Find the electric field at space point P at a distance a on the y axis from the coordinate origin. Write the electric field vector in i.j,k notation. P a X