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Ampere-meter : ウィキペディア英語版 | Ampere-meter
The ampere-meter which has the symbol A m or A·m is the SI unit for pole strength in a magnet. ==Derivation== Einstein proved that a magnetic field is the relativistic part of an electric field. This means that while an electric field acts between charges, a magnetic field acts between ''moving'' charges (as a charge moves through space more quickly and through time more slowly, its electromagnetic force becomes more magnetic and less electric). Therefore, the pole strength is the product of charge and velocity.
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