I still need help understanding. Please help

The diagram below shows a point P that hes at the origin of a coordinate system. A rod of length & that bears a positive charge 3( sits a distance d to the left of point R. Avery thin segment of the rod has been highlighted. Assume that this segment bears a charge d@, has width dir, and lies a distance la| to the left of the origin. The variable > is the position of the highlighted segment along the x-axis, so x is negative. 3Q, L dQ, dx P dE -O- d X +x X=0 1. What is the relationship between d() and do? Express your answer in terms of Q and L. dQ = of dx 2. Complete the following steps to find the electric potential at point R. Express answers in terms of Q, L, d, I and the constant k. V = = dQ * Incorrect -d y