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Homework Statement
Find the force of interaction per unit length between the upper and bottom halves of a cylinder of uniform charge density rho.
Homework Equations
Solution should be [itex]\rho^2R^3/3\epsilon_0[/itex]
The Attempt at a Solution
Frustrated cause I've solved this problem in the past and don't recall how to do it.
There's no analytic expression for the field of half a cylinder yes? How would I start to set the problem up? Would I have to find the interaction energy first then take its gradient?