Magnetic Levitation: The Basics
(Not of the Superconducting or Similar Variety)
Diamagnetism: M. Faraday (1846)
Magnetic Levitation of:
Graphite: W. Braunbeck (1939)
Organic Materials: E. Beaugnon and R. Tournier (1991)
F
º force acting on the body M º magnetic momentB
º external magnetic field M = (c /m o) (Volume) Br
º density of the material c º magnetic susceptibilityForce due to gravity: (mass) g =
r (Volume) g*
Balances the magnetic force when material isdiamagnetic ( i.e.
(assuming ideal conditions along the z-direction of solenoid magnet)
H2O levitates at [B dB/dz]
» 1400 T2/mGraphite levitates at [B dB/dz]
» 375 T2/m