1.1. Physical Foundations : The Lorentz-Force
In order to develop the physics of the interstellar journey, we need
theoretical foundations. Especially we are interested in the motion of
an electron in a homogeneous constant magnetic field. We assume a nonzero velocity
of the electron, oriented not parallel to the magnetic field lines.
between the acceleration of an electron by an electric field and by a magnetic field
simply is: A homogeneous constant electric field can set in motion a resting electron - a magnetic
Let us start our excursion with the Lorentz-force L - don't be afraid, we will
explain every term in it step by step.
The Lorentz-force is the sum of an electric force,
= Q ,
B = Q
In our case Q
is the charge of the electron,
confuse the elementary charge, |e|, and the electron charge, e); is the
electric field strength, is the electron velocity, is the
vector of the magnetic induction, and
is the vector product of the vectors and
In the following sections we set:
this was a bit too much at once for you, who heard about the vector product the first time.
For not having any complications in future, in the next section we give you a small introduction
to this part of vector calculus.
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