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Varying inductance of solenoid

  1. Jul 3, 2010 #1
    Can anyone explain the concept behind changing of inductance of a solenoid (when AC current is passing through solenoid) on moving a metal sleeve (hollow metallic pipe) over the solenoid enclosing the solenoid.
  2. jcsd
  3. Jul 4, 2010 #2
    The conductive metal sleeve is causing energy loss when the magnetic field is changing. It acts, basically, as a shorted turn on the solenoid. This reduces the magnetic coupling of the other solenoid turns, thus reducing the effective inductance.
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