Concept explainers
A thin rod of length L carries charge Q distributed uniformly over its length, (a) Show that the potential in the plane that perpendicularly bisects the rod is given by
where r is the perpendicular distance from the rod center and where the zero of potential is taken at infinity, (b) Show that this expression reduces to an expected result when r >> L (Hint: See Appendix A for a series expansion of the logarithm.)
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