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willem2
#2
Feb19-13, 01:58 AM
P: 1,396
Isn't that charge distribution antisymmetric, so the charge density at the point L-x along the wire is the negative of the charge density at the point L+x? Since the distance of these points to the point at a distance L in the middle of the wire is the same, the the contributions to the potential of these points cancels.