First, thanks for your explanation. It really helps to see where you're "coming from".
James lajoie jr said:
... This experiment was simply the first concept for finding our the answer i wanted.
...
2 magnets repelling each other but are fixed to each other won't be able to move.
So how could i get one magnet to move in one direction while keeping everything connected?
The idea is to hit one magnet field with another magnetic field that's not actually attached to anything
You're quite right about the two magnets joined to each other. Any force between them is pushing one forward and the other backwards, with no net result.
But this observation is even more generally true. We have conservation of momentum and Newtons 3rd law. If something gains forward momentum, something else must gain backward momentum or lose forward momentum, And if an object experiences a force in one direction, some other object experiences an equal force in the opposite direction.
This can get a bit confusing with fields, because we don't actually see objects touching each other, but it still applies. Whatever causes the magnetic field will experience the opposite force.
... Then i had to some how hit it with another field that's not attached to a magnet {electro magnetic pulse( basically a magnetic field pulse)}
You certainly could generate a magnetic field with another fixed coil or solenoid and power it continuously or in pulses. The cart magnet (coil, solenoid or permanent magnet) could be repelled by this, but as it moved away, the effect would weaken. Maybe you could have a sequence of coils, so that the effect could be extended.
The Youtube video of the electric "train" is something like this - an extended coil of wire, where it is powered only in the region around the "train".
Since you understand that problem, I guess that's why you thought about electromagnetic waves. These can be beamed in a way that magnetic fields can't. So perhaps you could have, say, a beam of microwaves directed at the cart, pushing it along. We're getting into water that is a bit deep for me, but I think you are right. I believe people (sensible, real scientists!) have thought about
powering spacecraft with the pressure of radiation from the sun. But the forces are very small - I think for photons (lumps of electromagnetic radiation) momentum is energy divided by the speed of light, so you need something like 100 MJ worth of radiation to provide 1kg m/sec of momentum - so its only useful for long space satellite missions, where there is very little "friction", a lot of time to accumulate momentum and, in our part of the solar system, over a kilowatt per square metre of free energy available from the sun. (WikiP says the plan was to use a 640,000m
2 reflector, utilising 800MW of solar radiation.)
Here, if you wanted to use electromagnetic waves to power a cart, you'd be better off using the energy rather than the momentum. Then using the power received to drive an ordinary electric motor pushing against the ground to get momentum.
I want to see how effectively i can maintain any movement by creating intervals between the magnetic fields actually hitting each other, and how fast i can get it to go.
This is where I lose the plot a bit. I don't see why you want to pulse the power? If you can get some sort of magnetic repulsion drive, why not run it continuously? What advantage do you want to get by switching it off intermittently?
What I suspect is that you are thinking of an analogy like throwing rocks at your cart. Each rock hitting it imparts a bit of momentum. But this effect can also be obtained by squirting a jet of water at it, or firing a continuous stream of small rocks (like sand grains) from an air jet. The quantum nature of throwing rocks is not an essential nor a useful part of the method. It's just that it's convenient to throw rocks by hand one at a time. The essential feature is, that moving mass has momentum and can lose some of it to the cart.
Magnetic fields don't have mass or momentum. They simply create a force. The force starts when the field is created and continues as long as the field is maintained. You don't have to (and can't) throw them at something (nor at each other.)
You can create a magnetic force between an electromagnet and a conductor, by switching the magnetic field on and off, because a changing magnetic field will induce a current in the conductor, which effectively makes it become an electromagnet and try to repel the causative changing magnetic field. This is a reason for using an AC (or pulsing) electromagnet, but the range and effectiveness would not be different from simply having two permanent magnets.
I don't want any magnets to actually move away from each other. Just the fields generated by them.
Again, I'm a bit out of my depth here. AFAIK a magnetic field doesn't move: it just is. The field from a permanent magnet or solenoid is everywhere at the same time. If it changes, the changes propagate at the speed of light (as electromagnetic photons, aka radio waves.) These changes carry energy, but relatively very little momentum.
I was asking how to create an emp that would help me see my experiment work or not work. I saw a design using a disposable camera but that was contained in a ring and only had a 1-3" range. This seems to weak to me.
But i have a limited understanding of electro magnetic pulses. And what they actually are...
I don't know much about what emps actually mean either. If it is simply a sudden change in electrical current, then I suppose the camera was used for its flash. Here a capacitor is charged up to a few hundred volts, then suddenly discharged through a glass tube containing Xenon gas at low pressure. The essence of this for emp is, that by charging the capacitor to a high voltage, when the discharge starts, the current will be large. So the current will change very quickly from zero to some large value. The sudden large change in current is what generates the emp.
If you want to increase the size of the emp here, you can charge the capacitor (not the same one - one with a higher voltage rating) to a higher voltage. The bigger the voltage, the bigger the current when it starts to discharge. You might find something other than a Xenon tube to discharge through, which would allow a bigger current to flow. Just a big switch would probably be good (though it would probably be damaged by arcing quite quickly.)
Any system like this is quite wasteful of energy. Some will be radiated electromagnetically, but much (maybe most) will just end up as heat in the circuit.
If you know what sort of photons you want emit, you should be able to increase the efficiency by making your circuit resonant at the required frequency and adding a suitable resonant radiating element. You can also get away from the pulse emp of this spark generator and move to a more effective, continuously radiating radio transmitter.
But let me reiterate, electromagnetic photons are not much good for transmitting momentum. If they are any use at all here, it is for transmitting energy, which you convert back to electric current to drive some sort of (conventional) motor to get movement.
1-3" range may sound weak to you, but I find it amazing that a camera can cause a mechanical effect even that far! (Though I suppose two Nd magnets would repel at that range.) I would be interested to see details of that experiment.
