Hi all, I'm dealing with a homework connected to the magnetic field. But I can't image how these things are generated. I can image that for the electric field, one can generate it by just applying a voltage different across two plates and you will get an electric field pointing from one plate to another. For the magnetic field, I guess it's basically the same thing, but I can't image how it's generated. Let's say, I have two plates, between which certain plasma or fluid fill, in this case, how can I fix the strength of the magnetic field at one plate to be B and the other to be 0, at the same time, the direction of magnetic fields are actually parallel to the plates? Sorry since I know this question maybe sound very strange.... Thanks.