How Aurora Generate Electrical Currents on the Earth Part III Demonstration of how a changing magnetic field creates an electrical current.To demonstrate how a changing magnetic field can create an electrical current, pick up the unit that consists of a meter and a coil of wire, and one of the cow magnets*. The cow magnet is about three-inches long and a half-inch in diameter. The cow magnet is a very powerful magnet. Keep it away from computer disks!
Hold the meter and coil in one hand and the cow magnet in your other hand so that you can push the cow magnet back and forth inside of the coil of wire. Now push and pull the cow magnet back and forth inside of the coil of wire. Note that the needle of the meter will move only when the cow magnet is moving. If the cow magnet is inside of the coil and not moving the needle of the meter stands still. When you change the magnetic field inside the coil by pushing and pulling the cow magnet back and forth, you are generating electricity shown by the movement of the needle of the meter.
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