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A square ABCD has charges $+q$ and $-q$ on the vertices A and C (diagonally opposite sides). How can I place point charges outside this square so that electric field lines are parallel to all the sides of the square.

note: This problem approximately simulates a square shaped conductor having potential difference between A and C (due to a battery). So, we've to place image charges outside this square to match the boundary conditions and solve poisson's equation. (Image method of solving poisson's equation)

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Hi user5198 - this is a site for conceptual questions about physics, not general homework help. If you can edit your question to ask about the specific physics concept that is giving you trouble, I'll be happy to reopen it. See our FAQ and homework policy for more information. – David Zaslavsky♦ Sep 16 '12 at 20:38

closed as too localized by David Zaslavsky♦ Sep 16 '12 at 20:38

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