Predict/Explain In Conceptual Checkpoint 19−3, suppose the charge to be placed at cither point A or point B is +q rather than − q. (a) Is the magnitude of the net force experienced by the movable charge at point A greater than, less than, or equal to the magnitude of the net force at point B? (b) Choose the best explanation from among the following:
I. Point B is farther from the two fixed charges. As a result, the net force at point B is less than at point A. II. The net force at point A cancels, just as it does in Conceptual Checkpoint 19−3. Therefore, the nonzero net force at point B is greater in magnitude than the zero net force at point A.
III. The net force is greater in magnitude at point A because at that location the movable charge experiences a net repulsion from each of the fixed charges.
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