UVA Virtual Lab: Scanning Electron Microscope (SEM)
               
 
© 2003-2009 J.C. Bean
 
To figure out WHY the electrons bend inward, we must apply the law of magnetic force (the "Lorentz Force Law"):

F = q (v x B)

Here we show the path of an entering electron along with vectors for its velocity and the magnetic field it encounters.

 
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