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Physics: Potential of an electric field at a large distance

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Find the potential Φ of the electric field at large
distance r from two close parallel infinite straight
line charges λ [C/m] and −λ [C/m] separated by
distance a << r.

Give a physical interpretation of the result.

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https://brainmass.com/physics/gauss-law/physics-potential-of-an-electric-field-at-a-large-distance-401216

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