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Unformatted text preview: Electric force like gravity are long-range forces. These type of forces introduced the concept of action at a distance. The term field which comes from mathematics, describes a function f (x, y, z) that assigns a value to every point in space. When used in physics, it meant that the physical entity exists at every point in space. That is, what Faraday suggested about how the long-rang forces operate. The charge makes an alteration everywhere in space, then other charges respond to the alteration at their position. The altered space is the agent (cause) that exerts the force on B. 25.5 The Concept of a Field So we can call the alteration of the space around a mass is the gravitational field , and the space around a charge is altered to create the electric field. Now we can distinguish b/w the concept of a particle which was used in Newtons laws of motion, to study the motion of a particle in space from one point to another (trajectory). and the field which exists at the same time at all points in space. This model describes how two charges interact: 1. Charges, which we will call the Source Charges, alter the space around them by creating an electric field ....
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