You have probalbly already seen one of those
simple homopolar motors.
In this clip however...
Let's have a look at a visualisation of the
basic functional principle of those motors.
At first we have a small neodyn neodym magnet
and we partially visualize the magnetic field.
In order to simplefy this we visualize this
for the moment only a certain plain partially.
Now you may applay any of your common mnemonic
tricks you've already learned.
Moving electrons in a magnetic field experience
a force perpendicular to that magnetic field
AND the direction of the flow of those electrons.
This force is visualized here with this red
vector.
Let's also have a look at the second example.
The question arises, whether the magnetic
field itself also rotates...?
Instead of focusing on that Faraday Paradox
you could also just change our ventage point...
our inertial system...
We assume the magnetic field stays locked
with that magnet.
Now we just hold on and stay with that magnet
in our new rotating inertial system.
Now the force applys outside of that magnet
on that wire and the whole wire with the battery
spins around.
This new scene should be recognizable.
