the way my physics teacher told it, a monopole is kind of like a magnet. a magnet typically has two ends, one positive and one negative (can't remember if he called a magnet a dipole or a bipole). a monopole has two same-charged sides, and no oppositely charged side. Cutting a normal magnet won't create a monopole, because the freshly cut side is oppositely charged from the non-freshly cut side (effectively, two smaller d/bipoles).
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