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ELECTROMAGNETIC LENSES

 
Deflection of electrons (i)
    G1: 1 of 2
 

A charged particle such as an electron, is deflected by a magnetic field. The direction and magnitude of the force F, on the electron is given by the vector equation:

F = e(v B)

v is the instantaneous electron velocity
B
is the magnetic field
e is the charge

The force acts perpendicular to the field and velocity. This causes the particle to move in a circle. This is animated opposite by clicking on the start button.

In the diagram v shows the initial velocity of the electron, so the initial force is downwards, resulting in a circular path around the magnetic field line

 

 
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