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A rod of length 2L lies on the x-axis, centered at the origin, and carries line charge density λ = λ0(x/L), where λ0 is a constant, (a) Find an expression for the electric field strength at points on the x-axis for x > L. (b) Show that for x >> L your result has the 1/x 3 dependence of a dipole field, and determine the dipole moment of the rod.
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