5:42 PM, David Roberson <[email protected]> wrote: > I am not sure that this will get anywhere but I can answer the question > according to what I would expect. > > >So if you were moving with the electrons/neg-balls, would you see a > magnetic field from the protons/pos-balls in the other wire/pipe? > Since those protons are moving relative to your reference frame? > > And if the electrons/balls moving with you did see such a protonic B-field > would they not be attracted from cutting through it like that?< > > An observer moving with the negatively charged electrons within one wire > would see a magnetic field due to the motion of the protons in the far > wire. > > But, the electrons are not moving according to your new reference frame > and would not be affected by any magnetic fields.
Maybe you are unaware, but a stationary charge can be effected by a magnetic field that is moving relative to it If you had a negatively charged ping pong ball on a string, and you lowered it towards a magnetic rotor that was turning (shielded from wind), the negatively charged ball would be pushed perpendicular to the magnetic field (radial) and the direction of motion, so you would find your ping pong ball pushed to the side. Only relative motion is required between a magnetic field and the charge. You can accept the electrons in the wire would see a magnetic field from the protons in the other wire right? (you said so above) So is that magnetic field moving relative to our electrons? If it is from the protons that are moving then yes it must be. I hope you follow this, if the electrons see a magnetic field from the protons that is moving relative to the electrons frame, then they should see a voltage, a force attracting them to the other wire right? The protons of the wire you ride upon would however be effected by the > field generated by the other wire's proton motion. Why? The protons in each wire are stationary relative to the protons in the other wire. They would not see any magnetic field from the other protons as it is the same thing again, no relative motion, no magnetic field, no force from magnetism. > This interaction would lead to attraction between the wires. > The attraction comes from the protons in one wire seeing a magnetic field from the electrons in the other wire which they have a relative motion with which both creates the magnetic field and the cutting of the magnetic field. The electrons that are moving in that wire likewise sees the protons in the other wire as having a relative velocity, and hence having a magnetic field and relative motion to that magnetic field. Can you understand this? You are proposing that the magnetic field is between stationary protons and other stationary protons. And relatively stationary electrons and other relatively stationary electrons. I am saying it is between electrons in one wire that have a relative velocity to protons in the other wire, and visa versa. I can see no reason why in your example if the protons in one wire are attracted to the protons in the other, what the need is for the electrons to be moving for them to feel this force? John
