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Electric Field and Gauss Law

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4) A charged ball with charge l0 Coulombs is placed at (0,0,0). A charged ball with
charge -5 Coulombs is placed at (2,0,0).

a) Where do you place a +2 Coulomb ball so it will feel no net force?
b) What would be your answer if the test ball were -4 c not +2 c?

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The solution discusses an electric field and Gauss Law.

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