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1.39 Chessboard **

An infinite chessboard with squares of side shas a charge eat the center of every white square and a charge -eat the center of every black square. We are interested in the work Wrequired to transport one charge from its position on the board to an infinite distance from the board. Given that Wis finite (which is plausible but not so easy to prove), do you think it is positive or negative?

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