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Questions tagged [levitation]

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1answer
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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 ...
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1answer
23 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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1answer
28 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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2answers
94 views

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 tree to the points of ...
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2answers
50 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 ...
2
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1answer
165 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 ...
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0answers
15 views

Advice on debugging ultrasound standing wave setup

I'm trying to set up an ultrasonic standing wave powerful enough to levitate polystyrene - on a budget (i.e. nothing's quite what I'd like it to be ;)). I have not yet successfully demonstrated a ...
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2answers
140 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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1answer
58 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, ...
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2answers
2k views

Any solutions to Veritasium's hydrodynamic levitation?

So this Youtube video has been around for a while now Veritasium Hydrodynamic levitation! . Also this Fluid Mechanics explanation of an object levitated next to an air jet may be related. I just ...
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3answers
2k views

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 ...
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1answer
163 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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2answers
861 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 16mm diameter disc magnets. I am ...
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1answer
69 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 ...
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1answer
63 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 ...
0
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1answer
173 views

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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2answers
73 views

Does a field weighs something?

Imagine you put a magnet on a scale and you could manage to keep another magnet with the same pole above it. So the upper magnet is floating above the other one with a magnetic field in between. Does ...
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0answers
204 views

How does the “lifter”/ionocraft device work? [closed]

A while ago I watched a documentary which at the end (don't let the name mislead you, I'm asking about a perfectly real phenomenon) shows an experiment which its inventor calls a "lifter"/ionocraft. ...
1
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1answer
995 views

Could a man float in a large enough magnetic field to simulate zero gravity? [duplicate]

I know the magnetic field would need to be very large, but if an organisation like NASA with huge funding and resources could build a large enough device, could a man float in that magnetic field to ...
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1answer
5k views

How does the levitating water illusion work?

After watching a movie in which levitating water was used as an illusion, I was curious to discover how it works. Unfortunately I cannot find any great explanations of the science behind the effect, ...
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1answer
633 views

Can we use radiation pressure to push/levitate a human?

I want to know, at least in theory, are there any safe em wavelength that could affect human body as net force and do no harm? To put it bluntly I want to know is it possible for levitate a human on ...
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2answers
518 views

Levitation inside a solenoid

Is it possible to levitate something inside a solenoid? If yes, is it possible in any direction (horizontal, vertical)? Also, is it possible when an object is traveling through? Thanks in advance!
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1answer
462 views

Could I pick up a human with a strong enough magnet? [duplicate]

Could I pick up a human with a strong enough magnet? Humans contain magnetic materials, such as iron.
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1answer
208 views

Is it possible to levitate large objects through diamagnetic levitation?

I am currently building a diamagnetic levitator with a strong neodymium magnet, two slabs of bismuth (a diamagnetic material), and a small neodymium cube to levitate. However, I was wondering if it ...
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4answers
8k views

Can lasers lift objects?

I have been fascinated by a very intriguing question - Can lasers push objects up? I have done the below math to find out Lets say we have a $1000~\text{mW}$ laser and we would like to lift an ...
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0answers
179 views

Stabilizing a shaft with only one electromagnet

I have recently come across Earnshaw's theorem in my research which states that it is not possible to stabilize an object using only static permanent magnets. I understand that and it makes sense to ...
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1answer
529 views
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2answers
114 views

Can Acoustic levitation be used to contain antimatter?

Can Acoustic levitation be used to contain antimatter? To me, It sounds like an obvious use of the phenomenon, but I didn't find any documentation about anyone trying this on the web, which could ...
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0answers
657 views

Magnets levitation stability

I'm willing to make a levitating stand based on standard magnets. Both the stand itself and the levitating object would have magnets attached, of course the same poles heading each other. I have two ...
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0answers
120 views

Superconductors and hoverboards

We know that superconductors are repelled by magnetic fields. The earth has a magnetic field of about $10^{-5}$ Tesla. I just want to know if it is possible to use this property of earth to make hover-...
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0answers
237 views

does thickness of a diamagnetic material affect the mag-lev effect?

I built a little mag-lev display, basically a desk ornament, as a fun project/learning experiment. It's a fairly basic setup with a neodymium magnet suspended between two thin sheets of pyrolytic ...
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2answers
132 views

Can a coil of wire levitate over another, if so how?

I have been looking at Maxwell's equations (intergral form it's easier to understand): $$ \\\iint_{\partial\Omega}E\cdot dS = \frac{1}{\epsilon_{0}}\iiint\rho\cdot dV \\\iint_{\partial\Omega}B\cdot dS ...
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2answers
60 views

Can an Adequately Long Tube Float?

I was just pondering in my head one day (I don't recall what I was pondering), but I came across the thought: If an adequately long (and light) tube is placed in the atmosphere, can the difference in ...
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2answers
582 views

Flywheel energy storage: Why not use room temperature diamagnets instead of superconductors?

Flywheel energy storage has garnered some interest from academia and industry for its potential to store surplus electrical energy efficiently in kinetic form. Modern designs use magnetic bearings ...
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1answer
1k views

Repulsive Force between two Electromagnets

This question might seem a bit too basic(or advanced!), but it is the one to which I'm really desperate to find a simple enough explanation and solution. Ok, So here's the problem, I have two ...
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1answer
112 views

How does the hendo hoverboard achieve omni-directional movement?

An older thread already gave away the wonderful details of how the Hendo hoverboard achieves levitation, but how does it achieve its form of omni-directional control and movement? My idea was that ...
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0answers
83 views

Question about Meissner Effect video

In this video, what material is on top of the superconductor disk that keeping it cold? Is it just a circular chunk of dry ice? http://www.youtube.com/watch?v=Ws6AAhTw7RA I'm planning on recreating ...
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0answers
138 views

Lifting capacity of superconductors

How does the strength of the magnetic field the superconductor is exposed to affect its ability to levitate/lock heavier objects? Or is there no relationship (for superconductors) between magnetic ...
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1answer
2k views

Why is the Meissner effect not used for levitation in MagLev trains?

The Meissner effect does not seem to be used as primary source of levitation in MagLev trains, instead, electromagnetic and electrodynamic syspension are mainly used. Why is this? Could it be that the ...
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2answers
3k views

Magnetic Levitation : Confusion with Lenz's Law

Considering the above diagram, I am failing to see why the aluminium ring floats upwards rather than oscillates. I understand Faraday's law, but I am struggling with Lenz's law - as there is an ...
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2answers
84 views

Is this a possible monopole setup, or will it cancel out? [duplicate]

Suppose you have a ball that is covered in magnets, in which the North Pole of every magnet faces outward. Is this a monopole? Or at least "functions" as a monopole? And what will happen if you placed ...
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0answers
69 views

Magnets quantum locking/levitating [duplicate]

How does cooling a magnet allow it to quantum lock/levitate? I have seen it in videos but do not know how it works.
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1answer
11k views

How much magnetic field will be required to levitate a human? [duplicate]

According to this video: http://www.youtube.com/watch?v=BqKeiiezqzc it should be possible to levitate humans because the water in our bodies is diamagnetic - but it is stated (at 1:14) "although ...
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0answers
210 views

Why does this 'Quantum Pinned' superconductor allow easy repositioning

I'm confused by videos such as this (popular demonstration of 'Quantum Levitation'): https://www.youtube.com/watch?v=Ws6AAhTw7RA So my current understanding of superconductors is that when in the ...
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2answers
64 views

What determines the alignment of an object levitating in a magnetic field?

Can you explain why sometimes (more often) a levitating object is not horizontal and sometimes it is perfectly horizontal?
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2answers
933 views

What is the exact physics behind sonic levitation

Me and a group of friends decided to choose sonic levitation as our research topic. However, after looking up the theoretical background, we hit a roadblock: (Here is an image of a standing sound ...
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1answer
129 views

Hendo Hoverboard

What if the Hendo hoverboard had a magnetic surface connected to it under the engines so that the current could always be occurring, would it then be free to float over anything?
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2answers
389 views

Why can't we fly? [closed]

Why can't we fly? It contradicts with our known laws of physics, but which one? Is it possible that once we know gravity better we would be able to fly using some sort of anti-gravity machines like ...
2
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1answer
1k views

Magnetic levitation frog example

I'm trying to figure out the strength of the magnetic field needed to levitate the frog, assuming it's spherical, has mass $5$kg and diameter $20$cm. I also assume $\vec{B}$ is uniform. Since it's ...
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3answers
27k views

How does Hendo hoverboards achieve the self-propelling motion? What is the MFA?

From what I understand of the idea behind Hendo hoverboards, they use four disc shaped hover-engines to generate a self-propelling motion. I also understand that it uses Lenz's law and eddy currents. ...