Four negative point charges of charge −Q are positioned as shown in the figure, each a distance a from the origin. a) Calculate the magnitude and direction of the electric field at the origin. Then, with the charge on the right now removed, calculate the magnitude and direction of the electric field at the origin for this three-charge configuration. b) The charge on the top is now removed as well. Calculate the magnitude and direction of the electric field at the origin for this two-charge configuration. c) Calculate the magnitude and direction of the electric force exerted by the two remaining charges on a negative point charge of charge −q placed at the origin. [Note that physics is case sensitive, so q is not the same as Q.]

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.