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Imagine two positive charged objects, one at the origin, one on the x-axis at (3, 0, 0). On their own, they will repel each other.

Imagine two positive charged objects, one at the origin, one on the x-axis at (3, 0, 0). On their own, they will repel each other. What if you place a large sheet of plastic or other insulating material in between, will they still repel? What about a large sheet of copper or other conductor?

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