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Wire Through Magnetic Field

  1. Oct 3, 2006 #1
    I fail to recall this concept. When only a north pole magnetic field is passed along a wire, and then the magnet passes the reversed direction, does the electric current become an AC? The wire never enters the south pole magnetic field.
     
  2. jcsd
  3. Oct 3, 2006 #2

    berkeman

    User Avatar

    Staff: Mentor

    When the magnetic flux through a wire *loop* changes, that induces a voltage between the ends of the loop. If the flux is changing at a constant rate (like increasing linearly), the coil voltage is DC. If the flux is changing with time (like moving a magnet past a loop, or as in the secondary of a transformer), then the output is AC.
     
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