Okay so I did some research into magnets, specifically into the magnetic field generated by a wire. I've been taught that the moving current causes relative compression of the moving charges due to special relativity.
Then why do the magnetic field lines go circular around the wire rather than straight in to the wire?
>>7945686
They form at 90 degrees to the direction of flow (the wire)
The magnetic field can be thought of in terms of the relative change in the electric field due to the motion of electrons. The reason you get these closed loops is because whenever the strength of the E field increases when an electron flows towards it, there's a relative decrease in the E field from where it's flowing away from. When you have a wire with a continuous current flowing around it, the net strength of the E field at any point isn't going to change because whenever an electron moves out of a spot there's another to replace it, but the flow makes almost like a vortex if that makes sense? This isn't a rigorous description in the least but it was a useful conception for me when I was taking upper div E&M.
>>7945725
Any websites that might be helpful? Pages like wikipedia just tells me about the right hand rule (which I know) but im more interested in why this happens
>>7945686
[eqn]
\phi = BA
[/eqn]
Just think of magnetic fields as fields formed perpendicular to the wire the current's flowing through.
>>7945856
BUMPU-DESU~!!
