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Electric Field - A Field of Force

An electric field is defined as being present in any region where a charged object experiences an electric force.  This is a fancy way of saying that the only way we can tell if a field exists is to place a test charge at that spot and see if it feels a force.  (In other words, it takes one to know one.)   The animation below shows a stationary charge (Although we have no way of knowing it is charged until we bring in a test charge.) When a test charge is brought in...

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