I know when a charged particle moves across a magnetic field, a force (according to Lorentz force law) will be applied to this particle.
There are however a three things I do not understand very well.
Every force is a par action/reaction, so where will the reaction force be applied to? Is it to the source of the magnetic field?
I suppose that a moving charge across a magnetic field will experience a perpendicular force to it's velocity and to the field because the moving charge will create a magnetic field and this magnetic field created by the charge will interact with the "main" magnetic field, right? So how do exactly two different magnetic fields interact? I mean if the field created by the moving charge has no poles how can it be attracted/repulsed by the main field?
A moving charge creates a magnetic field. What if I have a stationary charge on my hand and someone walks around me? I guess that I won't see any magnetic field but the person walking will see?