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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Lecture 12 4 Magnetic Force and Sources Note, that currents are by nature not “point-like”, but we will start with looking at the force between two “very short” pieces of “wire” carrying currents I 1 and I 2 – This is necessarily an idealization! A current can only flow in a LOOP! – By integration over the loops, we can calculate the total force between the currents… and compare with experiment Currents in a wire have both a MAGNITUDE and a
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This note was uploaded on 04/14/2010 for the course PHY 132 taught by Professor Rijssenbeek during the Spring '04 term at SUNY Stony Brook.

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PHY132_L12 - Classical Physics II PHY132 Lecture 12...

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