Magnetic Fields I
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The Electric Universe, by David Bodanis
Dr. Walter Lewin (MIT)

Mechanical Universe

Magnetic Activities

Magnetic Forces and Fields


Properties of the magnetic force F on a
charge moving in a magnetic field B

Magnetic Force acting on a Current-Carrying Conductor
Magnetic Domains

Hans Oersted

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Torque on a Current Loop in a Magnetic Field

The Torque due to
the Magnetic Force on the Current-carrying loop is changing from a maximum to a minimum through a quarter rotation

Motion of a Charged Particle in a Magnetic Field

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The Velocity Selector

The Mass Spectrometer

Thomson demonstrated that this glow was produced by a flood of particles, all with identical charges and mass, flowing out of the cathode. He called these particles ELECTRONS and made the first step in determining their physical properties by measuring their charge-mass ratio (q/m).
The Hall Effect

  Problem: A flat copper ribbon 0.330 mm thick carries a steady current of 50.0 A and is located in a uniform 1.30-T magnetic field directed perpendicular to the plane of the ribbon. If a Hall voltage of 9.60 microVolts is measured across the ribbon, what is the charge density of the free electrons? What effective number of free electrons per atom does this result indicate?

Quick Quiz 29
. . .on to Chapter 30 - Sources of Magnetic Fields