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Magnetism

Magnetism. R. Pearson PMHS 2007. Some Definitions. Magnetic Field

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Magnetism

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  1. Magnetism R. Pearson PMHS 2007

  2. Some Definitions • Magnetic Field • Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. The magnetic field B is defined in terms of force on moving charge in the Lorentz force law. Magnetic field sources are essentially dipolar in nature, having a north and south magnetic pole. The SI unit for magnetic field is the Tesla, which can be seen from the magnetic part of the Lorentz force law Fmagnetic = qvB to be composed of (Newton x second)/(Coulomb x meter). A smaller magnetic field unit is the Gauss (1 Tesla = 10,000 Gauss).

  3. Magnetic Field Lines for a bar Magnet Are these Like the E field lines?

  4. How could we trace the field lines of a Magnet? Can anyone think of something that measures the direction of a magnetic field? How about a really big object with a magnetic field?

  5. Of course it’s a compass

  6. Did you know your door bell is like this

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