Question: The z-axis is the symmetry axis for an origin-centered ring with charge Q and radius a which lies in the x-y plane. A coplanar and

The z-axis is the symmetry axis for an origin-centered ring with charge Q and radius a which lies in the x-y plane. A coplanar and concentric ring with radius b > a has charge −Q. Calculate the lowest non-vanishing Cartesian multipole moment to find the asymptotic (r →∞) electrostatic potential if both charge distributions are uniform.

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