selonoid and magnetic field?

Question

Hi any and everyone its mica here
how does passing a current through a selonoid create a magnetic field. I want to know exactly how there Amps law and maxwel equation but how does it actully happen? pls I am doing a lab report and am extremly confused.

Answer 1

A wire with a current has a magnetic field going around it, if you wind the wire around a core, then because the current is all going the same way, all of the magnetic fields from all the wires are going the same way and are concentrated [all the fields on the outside are also going together the other way, but they tend to spread out.] Thus the field inside the core is strong and pulls a metal slug into the core, which is the solonoid action.

Answer 2

Actually, the answer to this is extremely complicated and has a lot to do with relativity and some very messy caclulations. The simplest way to put it is this. There is a simple force, the force of attraction/repulsion between two charged particles. Ignore magnetism and everything else at the moment. As particles move very fast (close to the speed of light) like electrons and elementary particles tend to do, they become subject to relativity which Einstein laid down. What happens is that fast acceleration in one direction can cause velocity in another direction. Using the Lorentz transformations, you realize that accelerating under a force in one direction actually causes a velocity change in a perpendicular direction (right hand rule). This velocity is relatively rather small but induced magnetic fields as well as induced current are also relatively small. If you want to figure out the actual source of the equations, you could attempt to apply the Lorentz transformations to a simple system of charged particles using only the original equation for the force caused by them. I doubt you wish to do that though. it would be a terrible headache that probably wouldnt even work out nice.

Answer 3

study Maxwell's equations