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The motion of electric charges is an electric current and produces a magnetic area. Many electromagnets are made by wrapping wire round a ferromagnetic core . When the coil isn’t powered by a battery or other source of electrical energy , no magnetic subject is present, as shown in the image to the left. When the present shuts off again , the magnetic goes away, and the paper clips are dropped. You can see this effect much more clearly in our Introduction to Magnetism video.