Michel Jullian wrote: > ----- Original Message ----- > From: "Stephen A. Lawrence" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, January 23, 2007 5:06 AM > Subject: Re: [Vo]: Energy *Violations* using *standard* physics > > > ... >>> Good, then you do acknowledge there is *real work* >>> being done while two magnetic dipole >>> moments rotate toward alignment. >> Absolutely! The "magnetic fields do no work" mantra fails. It is false. > > Forgive me for jumping into the discussion without having followed it all. "Magnetic fields do no work" wouldn't make sense anyway. Work is done by forces. It's the _force on a moving charge due to the magnetic field_ qv × B which does no work (I don't suppose you dispute that?), not the magnetic field per se. > > ... >>> Another option is perhaps there's a decrease in >>> electron velocity. The electron must >>> always be in motion, correct? Therefore, there's >>> always room for the electron to slow down. >> I don't think so. The linear motion of the electron is not at issue; >> its dipole, which is providing the energy here, is due entirely to its >> "spin". > > Well not quite entirely, the current loop consisting in the orbiting motion has got to contribute _some_ magnetic dipole moment to the atom, however small this effect may be compared to that of the rotating motion.
That's very true. Most of the field in ferromagnetic atoms comes from intrinsic electron spin, not orbital spin. For example, in Alnico 5 94% comes from intrinsic electron spin. In Sm2Co17 63% from intrinsic electron spin. Paramagnetic materials is another story, but it's relatively weak. Regards, Paul Lowrance ____________________________________________________________________________________ Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games. http://games.yahoo.com/games/front
