# Questions tagged [levitation]

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### True magnetic levitation with permanent magnets only

I am aware of (and believe, even though I can't myself derive the conclusion) the Earnshaw's theorem that says that true levitation using only permanent magnets is impossible, I'm more like looking ...
• 11
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### What are the conditions according to which the levitation force between a magnet and a superconducting material tends to zero?

According to this article, for a disk-like superconductor and a magnet, if the radius of the superconductor tends to zero or the radius of the magnet tends to infinity, it seems that the levitation ...
• 2,503
31 views

### If I levitate at the same place will I come back to the same place after Earth taking it's one complete revolution? [duplicate]

so i have this question if i mean if we can levitate and decide to levitate and not stay on ground but at a place to look the ground, and we that earth rotates right and we rotate along with it cause ...
1 vote
128 views

### Behaviour of weightless objects (objects in a state of zero gravity) in a vacuum

SCENARIO 1: So lets say there is a room with no air in it, meaning the room is a vacuum. Now lets say there is a single metal cube (the metal cube is 5kg) in the room, of course gravity still exists ...
1 vote
65 views

### Does a levitating super conductor (Meissner effect) add weight?

A platform is placed on a weight scale. The scale reads 1kg. A super conductor weighing 100g is placed on top of the platform and it levitates such that no physical contact is made to the platform. ...
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1 vote
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### Meissner effect and Coanda effect

1) I've come up with the Meissner effect in my job recently: (Magnetic field lines through a conductor vs. field lines through a superconductor) 2) And today I saw a video of Mark Rober explaining ...
1 vote
34 views

### Levitation of a permanent magnet over a conducting surface

I have seen a method of magnetic levitation where a magnet moves over a conducting surface with its north pole facing downwards (or the conducting surface moves below the stationary magnet). At a fast ...
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### Theoretically, how can you remove friction between surfaces with air?

I know that if there was a way to compress and control air (think air bender) then it can be used to remove friction between two surfaces. A person could just skate on their feet by focusing this ...
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1 vote
140 views

### Acoustic Levitation Calculations

I have recently started studying acoustic levitation and I would like to lift an object that is about $2.5 \,\text{lb}$. Surface area is about $5\,\text{in} \times 5\,\text{in}$. I am not very ...
620 views

### How much frequency is needed to make a tennis ball levitate, using only sound? [closed]

I am planning to make a device that will catch a tennis ball using sound waves to slow down its motion, and make it levitate. But how strong should the sound waves be? Please tell me if there are ...
41 views

### If you had a good enough power source, could a gyroscope be used for flying/levitation

I don't know anything about physics, this is a shower thought i need answered for inner peace. Also, if the answer is yes, HOW good would the power source need to be, let's say electricity wise, to ...
72 views

### Levitation with electromotive force

Is it possible to achieve levitation, if you have an electromotive force, with an electrostatic charge? Using a coil, and a sheet of aluminum or something
126 views

### Ideas for levitation using Earth's magnetic field and mu-metal [closed]

I'm not sure the idea works or not. Please answer it and its reason. As shown in Figure 1, when the ASTM A753 Alloy2 magnetic shielding alloy is exposed to an external magnetic field, the applied ...
23 views

### Difficulties in modelling magnetic levitation system? [duplicate]

I'm currently working on a project surrounding magnetic levitation with an electromagnet having to levitate an object underneath itself. I have taken a look at research papers, examined their ...
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1 vote
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### Nature of levitation bahvior in superconductor magnetic pinning

I am aware of superconductor levitation (eg. https://youtu.be/Vxror-fnOL4) and have a vague knowledge that it has something to do with superconductor pinning of the magnetic field, but I have no ...
109 views

### Aerodynamic Problem in regards to a ping pong ball and an open hole tube

I have a ping pong levitation system with a ping pong ball in a tube being pushed by a DC motor fan (shown below) and I'd like to define a relation of the ball's height with the air velocity or ...
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1 vote
124 views

### Is it possible to create a magnetic environment where it pushes and pulls at the same time, making the target “levitate”?

To better understand why I ask this, the backstory is I’m getting more and more annoyed by rolling office chairs rotating, hitting my ankles, hard to switch directions when wheels having ~90 degrees ...
371 views

### Is it possible to use forces on a current carrying conductor due to Earth's Magnetic field to levitate?

When current is applied, a conductor within a magnetic field feel a force. This is the Lorentz Force. I was thinking if it is then possible to apply as much current on a conductor that it will start ...
119 views

### Energy required to levitate an object

How much energy is required to maintain a $m$ kilogram body $h$ meters above sea level for a period of $t$ seconds?
3k views

### How strong of a magnetic field would I need to lift a human?

I know that there was that experiment they did to lift a frog by using the diamagnetism of the water in it's body, but how strong of a magnet would you need to lift a human in the same way? To lift ...
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1 vote
52 views

### How fast can we spin a large-diameter ring levitated by a well-designed and uniform magnetic field before running up against the laws of physics?

Assume that air-friction can be ignored. Assume that magnetic levitation supports the spinning ring so that hoop stress in the ring is not a limiting factor. Assume that "large-diameter" ...
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410 views

### Defying gravity with vertical shaking?

I saw this video on levitating a denser liquid on less dense air by vertical shaking. But I couldn't understand some points in the video. Particularly: How did the liquid levitate? I think it's ...
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1 vote
39 views

### What determines the height at which a superconductor hovers? [duplicate]

What determines the height at which a superconductor levitates? Can you just place it randomly in the magnetic field? What are the limits of superconductors?
1 vote
209 views

### Will superconductor levitate on Earth magnetic field?

We know the earth has both gravity and magnetism (which is very weak). Geomagnetism starts at the south pole and ends at the north pole. If I take a large sheet of superconducting material (very thin ...
107 views

### Is levitation possible through this apparatus?

If we had two rigid sheets which were exactly identical and we had the magnets on it as shown in the figure, then would the top sheet float above the bottom, which is fixed on a rigid surface. The ...
525 views

### Magnetic levitation using permanent magnets

Is it possible to achieve magnetic levitation (rail) using permanent magnets? So no electromagnets or superconductivity. If yes, how? If not, why not?
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### Explain hydrodynamic Levitation

I had researched it and I saw everyone has there different answer. Someone says its Magnus effect, someone says it is Coanda effect and someone says its Bernoulli's principle. Can it be specific? What ...
1 vote
128 views

### What is the approximate air pressure in acoustic levitation caused by the sound pressure? [closed]

I'm wondering how the sound pressure in acoustic levitation affects the actual air pressure within the standing wave. I've read that several atmospheres of air pressure can be caused by ultrasonic ...
145 views

### How do superconductors levitate magnets without oscillation?

For an electromagnet to effectively levitate a permanent magnet underneath it without external support structures, the electromagnet must be oscillating within a delicate range. I've heard that ...
8k views

### Could there theoretically exist a material so light, that it can levitate in the air just due to the in height decreasing air pressure? [closed]

Airplanes can fly because the pressure on the top of the wing is lower than on the bottom. But the difference in pressure must be huge in order to lift an enire airplane. Also, the difference in air ...
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3k views

### Earth magnetic field space elevator. No cable [closed]

I have an idea that the space elevator can be build in the following conditions: Not a classic theory. No cable. No Geostatic orbit. Not equator platform position The possible platform / base ...
23 views

### How does the change in helium distribution affect a floating balloon

I was wondering if we change the distribution of the helium gas inside a balloon, like if we trap it inside chambres or something, does that affect the overall levitation capacity of the balloon? ...
1 vote
58 views

### Can a magnetically levitating sphere spin in any direction?

I am trying to design a system that levitates a sphere (ball). I have found several solutions, however, it seems to me that the levitating ball only has one degree of freedom, i.e. rotation around the ...
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1 vote
2k views

### Sound Waves Moving Large Objects?

I recently read an article over using sound to move/levitate objects in mid air. Which is basically using sound to go against/defy gravity. For Many years Physicists have been able to move smaller ...
1 vote
53 views

### Optical trapping: factor 1/2 in definition of gradient force and potential energy?

If one consider the original deduction of the gradient forces that is applied to the trapped particle we can find the following: $$F_{grad}=\frac{1}{4} \alpha \nabla E_0^2(r),$$ where $E_0(r)$ is an ...
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1 vote
140 views

### Enhance magnetic field for a levitating plant [closed]

Problem I bought a levitating pot and it looks great! But I wonder if I can enhance the magnetic field somehow. Potential solution I thought of wrapping the base (which produces the magnetic ...
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### Magnetic levitation against Earnshaw's Theorem?

Given six strong magnets, what if we fix three of them to a table in a simple, horizontal, equilateral triangle-like formation (with their north poles sticking up), and the other three to the points ...
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1 vote
360 views

### Air pressure levitation

How much mass can you levitate with air? Take air hockey table for example, pressurised air is pushed through holes and they levitate a disk but how much mass is possible? I think it would probably ...
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1k views

### Can the Earth's negative charge make negatively charged objects levitate?

Since the earth's surface has a negative charge, could it repel a large highly negatively charged body? An example is an object on stilts carrying a negative charge that is heavier than air, maybe ...
1 vote
2k views

### If I use a magnet to levitate another magnet, where is the energy coming from?

Imagine I use one static magnet to levitate another magnet indefinitely. This levitating magnet is in a narrow tube that wont allow it to rotate and get attracted. So it will keep levitating forever, ...
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1 vote
81 views

### Behavior of liquid droplet in stream of gas

Hail to all magnificent physicists from a humble chemist! :) I'm working on an experimental setup for investigation of homogeneous nucleation and crystal growth in container-free environment. Well, ...
4k views

### Any research on Veritasium's hydrodynamic levitation?

So this Youtube video has been around for a while now Veritasium Hydrodynamic levitation! (2017). Also these questions Fluid Mechanics explanation of an object levitated next to an air jet and Explain ...
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### Can compressed air be used to make an object "float?"

Imagine a container filled with highly pressurized air. Now imagine that there is some object, maybe a marble, inside the container. Is it possible to cause the marble to "float" within mid-air, due ...
2k views

### Magnetic levitated electric wire

I'm thinking about making an instrument to show the force on a wire carrying electric current for students in lab. A normal wire which levitates from ground after it has current flowing in it. We ...
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2k views

### Halbach array and levitation

Full disclosure: I am a total novice when it comes to physics apart from being very curious and basic physics classes at school level (long long ago). Using 16 mm diameter disc magnets. I am ...
159 views

### Levitation, no levitation or instable levitation?

(forgive me any grammatical flaws, english is not my native language) hello, i know that according to Earnshaw's theorem a stable levitation cannot exist by only using permanent magnets. Similar ...
134 views

### Are quantum locked things slowed down by air resistance?

Me and my friend had an argument today whether Quantum Locked objects are slowed down by air resistance? He says that it isn't, that the magnetic field or something removes the air resistance. Could ...
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### Levitating Magnet Experiment [duplicate]

i want to make a levitating device with magnets. now i have some ideas but i don't know the math to work the numbers out. here is what is want to do : so the idea is basically to lift a device (about ...
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