Positive electric charge Q is distributed uniformly along a thin rod of length 2a. The rod lies along the x-axis between x=−a and x=+a (Figure 1). Calculate how much work you must do to bring a positive point charge q from infinity to the point x=+L on the x-axis, where L>a. To find V, divide the rod into infinitesimal segments of length dx1. Consider one such segment located at x=x1, where −a≤x1≤a. What is the potential dV at x=+L due to this segment?