This is shown in figure 2-19. In other words, electrons tend to move against the E field. When an
electron is being accelerated by an E field, as shown in figure 2-19, energy is taken from the field by the
Figure 2-19.Electron motion in an electric field.
The law of motion of an electron in a magnetic field (H field) states:
The force exerted on an electron in a magnetic field is at right angles to both the field and the path of
the electron. The direction of the force is such that the electron trajectories are clockwise when viewed in
the direction of the magnetic field.
This is shown in figure 2-20.
Figure 2-20.Electron motion in a magnetic field.
In figure 2-20, assume that a south pole is below the figure and a north pole is above the figure so
that the magnetic field is going into the paper. When an electron is moving through space, a magnetic
field builds around the electron just as it would around a wire when electrons are flowing through a wire.
In figure 2-20 the magnetic field around the moving electron adds to the permanent magnetic field on the