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PHY132_L12 - Classical Physics II PHY132 Lecture 12...

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Lecture 12 1 Classical Physics II PHY132 Lecture 12 Magnetism 02/22/2010
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Lecture 12 2 Magnetic Force MAGNETISM is yet another force that has been known since a very long time. Its name stems from the mineral magnetite, which is naturally magnetic. We now know that magnetism is the action-at-distance force felt between currents , i.e. moving charges magnetic materials contain currents, i.e. rapidly spinning and orbiting electrons, which “align” to give a macroscopic MAGNETIC FIELD B because the magnetic forces are between (moving) charges, there must be a deep relationship with electricity… Because motion is dependent on the reference frame of the observer, we expect connections with relativity as well… Again, we use the FIELD concept: Currents (sources of B ) generate a Magnetic field B everywhere in space, – and B interacts with the “test”-currents… 02/22/2010
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