We Can Figure This Out.org
Virtual Lab: Molecular Beam Epitaxy (MBE)
University of Virginia
             
 
© 2003-Present, John C. Bean
 
Iron tends to trap a magnetic field. The magnetic field emerging from the left and right ends of the magnet is thus diverted forward through the iron pole pieces.

To complete their loops, the magnetic field lines then jump between the plates in the volume where the electron emitter sits.

 
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