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Introductory Physics Homework Help
Three charges attached to the vertices of a triangle
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[QUOTE="gneill, post: 6385698, member: 293536"] Note that the question does not specify the sign of the "test" ion. It simply calls it "a fourth ion". It also doesn't ask for how many null force points exist, only if there is more than one. Presumably, given the geometry of the setup, there must be at least one such point for a given test ion. So if there are two choices of charge polarity for the test ion, there must be at least two such points... [/QUOTE]
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Three charges attached to the vertices of a triangle
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