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Find the electrostatic potential of an octupole made of the following charges: q1 = -q, q2...

Find the electrostatic potential of an octupole made of the following charges: q1 = -q, q2 = +2 q, q3 = -2 q and q4 = +q, the charges are placed along the x-axis with the following coordinates: x1 = -2 a, x2 = -a, x3 = a and x4 = 2 a. Evaluate the potential as an expansion in Legendre polynomials at a point P in the xy-plane.

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