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Problem 3.28 A circular ring in the xy plane (radius R, centered at the origin) carries a uniform line charge λ. Find the first three terms (n-0, 1, 2) in the multipole expansion for V(r, θ).

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rsin@tespr + rsine sie? +rce. Θ n sine cos φ cos φ+ sina sind sino _ 21 dpR. λ @sire Leosdcos φ,+ sin sin pil)

cipole momen olipola ︸ 4TrEo ra

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