Magnet through a copper tube, there's actually really cool videos if this on YouTube!
@FullMetalAlcoholist, HEY! I like your name...
@FullMetalAlcoholist, solenoid bltches
Science is undeNYEably awesome.
@CinnamondaWinnamon, punsniper is gonna get you for that one.
@CinnamondaWinnamon, I audibly laughed at that
@CinnamondaWinnamon, I know! Can you BILLeive it?
@CinnamondaWinnamon, science ruuuules.
@CinnamondaWinnamon, I agree its Bill-y Cool
@CinnamondaWinnamon, you got that from reading mean tweets, didn't you :)
Explanation: Dropping a magnet through a conductor induces a magnetic field in the conductor opposite the field in the magnet. That's how the nonemergency brakes work in trains. If you drop a magnet through a solenoid you will generate a voltage across the coil, that's the Hall Effect.
@amsku125, it's cooler if you use a superconductor...because then the magnet levitates and is extremely stable
@talmet, not all superconductors do that. You need a high magnetic permeability for the coil or a high gauss/mass ratio for the permanent magnet to get it to levitate or reject
@talmet, Actually nvm...all superconductors do that because of the Meissner effect. I'm physics and I'm having a hard time doing drunk.
@amsku125, easiest way to think of it.
Superconductors can *never have any electric field in them. If there was any, electrons move instantly (with no resistance) to cancel the field. Also, with no resistance, that movement creates no heat, and thus no energy loss.
If a magnet moves near a superconductor, it will create a changing B field. Which will create an E field in the superconductor...but previous paragraph said that can't happen, so it doesn't happen, so the magnet *can't move.
*means that that isn't really true, but you can think of it that way. You can also think of lenz's law, the changing B field creates a current in the superconductor to cancel out the changing B field. With a superconductor, the induced current will be whatever size will exactly cancel out the changing B field.
@talmet, really surprised nasa hasn't adopted magnetic suspension to keep joins from welding themselves shut in 0G.
@The Megaton Bomb, ...because superconductors only work at really low temperatures?
We have "high temperature superconductors" but that is high compared to the first ones that were found which needed like 30K...the new ones are like 138K, but that's still -135 Celsius.
Sure, space is that cold, but the inside of our ships aren't, so the superconductor would heat up and stop working.
If you're talking about like on satellites, that we don't need to hear to room temperature. I don't know, I'd guess that either: the working electronics still heat up the satellite to much, or the superconductors are just to expensive. Probably the first one, as space is a vacuum which makes it a very good heat insulator.
@talmet, doesn't have to be super conductors though. What comes to my mind is that you have a piece that is a cylinder (connected to whatever) and made so the top half is positive and bottom negative that is split into two before final assembly. Then you take a tube (similar to the copper pictured) with opposite polarity from how you will make the cylinder, and attack whatever you need to the tube. You take both halves of the cylinder and insert them into opposite side of the tube. The cylinder magnet would stronger than the tube so the opposite side of the tube will be less strong as the other half cylinder. Let the two cylinders cure and fuse together in 0G but the cylinder and tube won't be touching so the joint won't fuse. The joint can then be controlled by a third magnet to turn the tube around the cylinder thanks to more basic physics.
Is this a thing or is the amount of force required to get the magnets in place too impractical?
@talmet, on superconductor satellites: it might be easier to use superconductor on probes which can just have a coolant that gets ejected as it gets heated up.
@The Megaton Bomb, ok...I'm not sure I have your idea. But let me try to see if I do.
There are two objects, a cylinder and a tube.
The cylinder is a magnet...the top half is positive and the bottom negative? So, top is north and bottom south?
Then you cut the cylinder in half...if you cut a magnet in half, then you have two magnets, each with a N and S pole...did you mean cut in half longwise? So two half cylinders, each with a N and S pole?
The tube is a magnet, and is connected to machinery.
The tube is then put in the cylinder with the poles reversed.
Well, the tube has a North Pole by the cylinder's South Pole and vice versa...
So it's not very stable. If the tube is exactly in the center, the forces cancel and the tube stays there. If the tube gets bumped in any direction, the force on one side will be stronger than the other and the tube will "fall" to one side, and touch the cylinder.
@The Megaton Bomb, well...on a satellite using superconductors, with coolant that is used to keep it cold.
Idk...it would work, but the question is how much coolant is needed, and how long would the coolant last? I mean, if the satellite would need 50 tons of coolant every year...that's not feasible. But if it needed like 1/4 of a pound every 10 years, that's probably worth it.
@talmet, yeah about 3 or 4 drinks deep I thought...that doesn't make sense. But it makes sense that any small change in B makes some E which results in a huge current in a superconductor, making a huge induced B
@talmet, basically yes except while I know you don't get a separate positive and negative only halves, I was just wording that so it's less confusing how it goes after the cylinder is put back together.
That was my fear, that and it also wouldn't be practically solvable by adding a third ring to the outside and switching to be more locked inside of propelling magnets and sandwiched between attracting magnets.
The coolant is a question for those with the secret nasa contracts (the ones now all being sold to companies). Although I hold that probes are most likely the only good option since satellites you usually want back or to stay a while, while probes are usually one shots.
When she says she's a virgin, but you know something is up.
@Captain Kirk Hinrich, her pregnancy percentage?
Calling it now... This is exactly how we will be using transportation in the next 10-30 years. Using the earths magnetic force.
@ComedyPro, this is actually how maglev tech works now, but relative to its mass the earth has a pretty weak magnetic field so it's hard to extract much from it. It's staggering how much of our current tech works on the hall effect
we need copper streets and magnet skateboards
What this doesn't show is that the copper tube he's holding actually weighs 3.467 metric tonnes and is worth nearly a quarter the gdp of Zimbabwe.
And I'm just like, That's $500 worth of copper!
I was gonna make a joke about copper but I think it's not Cool.
(No ones gonna get that)
One step closer to levitation!😱
I had an idea using a similar concept but a somewhat opposite effect on a large scale. We launch magnetic rings into specific coordinates in space, like checkpoints. These rings would propell our rocket ships when they pass through, increasing the top speed, which doesn't slow down in space. These would have to be realigned after each use, but would create less need for rocket fuel, which is used in insane amounts for each launch. Sorry if this is hard to follow or you see flaws. Like I said... just an idea. Thanks for reading!
*Proceeds to watch for days.
Cause fjck you gravity!!
No pacemakers please.
That loop though.