How can you produce an opposing voltage in a _closed_ non-resistive current loop?
Michel ----- Original Message ----- From: "Paul" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, January 29, 2007 4:55 PM Subject: Re: [Vo]: Energy *Violations* using *standard* physics > Michel Jullian wrote: > > Your new experiment (attraction rather than > alignment) simplifies things somehow (no > torque, just linear acceleration), but let's stick to > the non-wire-resistive loop shall > we, it makes things simpler, and closer to the > electron orbit or spin counterpart you are > comparing it to. > > > > 1/ Using an external current source, let's start a > constant current through the loop. > > > > 2/ Zero wire resistance, zero radiation resistance, > > > > I would question that such a thing is even > theoretically possible for an electro-magnet. > Perhaps it is possible in another reality where light > travels instantly and hence no far > field. Or perhaps if the electro-magnets entire closed > loop is a 1-dimensional point, but > how do you have a closed "loop" with zero length. At > best it could be another reality, > but not our reality. > > > > > constant current so zero auto-induced voltage > -L*di/dt, so zero voltage drop. This > means we can connect the loop back on itself and > remove the current source without > stopping the current ok? Let's do that, so that loop > voltage will remain zero for ever, > and define this as time zero for the energy balance. > > > > 3/ Now let's release the magnet. It should indeed > be attracted and accelerated towards > the short-circuited current loop so KE will be gained, > but how could the energy be drawn > from the loop if voltage is zero? > > > Michel, for the most part the amount of energy > contained in the current loop depends on > its inductance and current. That is what maintains the > current. The current decay depends > on resistance, which you say is zero (no wire or > radiation resistance). So in your example > the current would remain constant if left alone. > There are other minor factors, but by > far that's the main factor. > > As the magnet accelerates (angularly or linearly) to > the current loop it produces an > opposing voltage in such current loop, which decreases > the current loops current. During > that span of time such opposing voltage is > "resistance" on the current loop, as indeed it > removes energy from the current loop. > > If the two objects continue to accelerate long enough > then the current loops current will > decay to zero amps. In such a case the two objects are > no longer magnetically attracted, > but they will continue to move depending how much > momentum is left, which will generate > negative current in the current loop. This will cause > the two objects to repel, and you > end up with two objects oscillating back and forth > *until* the energy is dissipated, which > will happen. > > During each oscillation the electro-magnet could use > such gain KE from the current loop as > it so desires. It could store such energy in a battery > for example, in which case the two > objects would quickly slow down until all the energy > is removed from the current loop. > The longest the two objects could oscillate would > depend how much energy is radiated > simply from the two objects moving in space. A moving > magnetic field generates radiation. > > > So as you can see, energy is indeed moved from one > source to the next at the moment it is > required. No magical PE required. :-) > > > Regards, > Paul Lowrance > > > > ____________________________________________________________________________________ > 8:00? 8:25? 8:40? Find a flick in no time > with the Yahoo! Search movie showtime shortcut. > http://tools.search.yahoo.com/shortcuts/#news >
