A naturally occurring permanent magnet material, a variety of magnetite, Fe3O4, known as a lodestone was known to the Greeks. The name lodestone, or alternatively and incorrectly loadstone, was derived from its navigational property of seeking the lodestar. The names magnetite, magnetism and all their derivatives stem from the name of the district where lodestones were found to be plentiful, Magnesia. The analysis of attenuate apple magnets adapted industry in the backward twentieth aeon and Ceramic Magnets apparently fabricated abounding of the computer advances possible. These magnets are acclimated in all-embracing applications and central tiny toys as well. The mining and assembly of attenuate earths has acquired an all-embracing absorption due to their abundant call in assorted applications.. This induced magnetic field is then repelled by one magnet and attracted by the other creating a rotational force. However, this rotating force would only be enough to rotate the shaft through one half turn as ultimately this would cause the poles of the coil to align with attracting poles of the permanent magnets and the motor would halt. By using what is known as commutator on the end of the axle, which resembles a Cast Alnico Magnet ring cut in half, the direction of current delivered through the coil by conducting brushes is flipped at just the right time. 1Determine the strength of the magnetic field you will be measuring. Natural sources of electromagnetism are typically very weak; for example, the Earth's magnetic field is about 0.5 gauss. Magnetic fields from electromagnetic transmitters might be as high as 2 gauss and the most powerful electromagnets can produce as much as 15,000 gauss.2Select magnetometers for a weak magnetic field from direct current. In an AC motor, the current is applied to the electromagnetic coils on the stator in sequence producing a magnetic field that alternates and rotates around the stator. Because the direction of the magnetic field in the coils is constantly changing it produces an electric current inside the rotor, which in turn produces its own magnetic field, which opposes that of the field that created it. The interaction between the two Ceramic Magnets fields causes the rotor to spin.. Not actually named after a fellow called Eddie – an eddy current is a swirling electrical current that is created in a conducting metal such as copper or steel by moving the metal through a magnetic field, or a magnetic field over the metal. The currents generated produce their very own magnetic field, just like any current flowing in any conductor. This newly created magnetic field opposes (repels) the original magnetic field that created the currents in the first place, creating a damping effect..

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