Four identical point charges, each with charge q = + 30 µC, are placed at the corners of a rectangle, as shown in figure. How much work must be done by an external agent to bring a charge Q = +56 µC from infinity to point P, located at the %3D midpoint of one of the 6.0-m long sides of the rectangle: 4 m P 3 m

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Capacitor

The capacitor is an element used to store electrical energy in the electrical field. A capacitor is a form of passive energy.