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What exactly do you mean by deep idea? I think you already have a great idea!
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Hi HRG
Since it is a metal object you cold look at superconductor magnetism/levitation. You need very little: some liquid nitrogen, a magnet and a piece of metal. Superconductors expel magnetic fields and so...QED
To use electromagnet you would basically place the superconductor inside the magnetic field
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but i don't think that liquid nitrogen would be available so easily, isn't there any other idea¿
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will the superconducting phenemenon floats the ball for specified time ?
will ther any other way .any circuit based ?
what about if we oppose the ball against the gravitational force using a opposing force created by electromagnetic circuit using a coil and reflector circiut .is this idea is possible ?
..
pls suggest me wit some circuits .im much awaitng for this project ....
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HRG
Yes. As the ball moves closer to its critical point it begins to fall.
There is a strange man in the US who has no formal training...just a purely scientific mind. I know he created such a levitation device out of ordinary stuff. I'll see if I can find it
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Try this
<a href="https://amasci.com/maglev/maglev.html" target="_blank" rel="nofollow noopener noreferrer">amasci.com</a>
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thank you mr.voltaire!
could you please explain me wat is the use of op-amp & photo transistors ?i read that these kinds of elements will be useful in designing the circuits!!!...
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Mate, ask the electric/electronic engineers; I have never tried to build one of these
Op ams here <a href="https://en.wikipedia.org/wiki/Operational_amplifier" target="_blank" rel="nofollow noopener noreferrer">Operational Amplifier</a>
I have never seen a phototransistor but info on it is at <a href="https://en.wikipedia.org/wiki/Photodiode" target="_blank" rel="nofollow noopener noreferrer">Photodiode</a>
You should use Wikipedia. It will answer most of your questions 😉
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hi
wiki provided me ....some..useful..ideas..!!😛...
but...im...still....confused.....how...to...develop....a...circuit.for...an..electromagnet circuit 😒
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Electromagnet
@HRG
Electromagnets are very easy to build. You need an iron core, some ceramic insulated wire and a DC source with plenty amps. The right hand rule applies.
The formula is B = N x (m[sub]0[/sub] x I)/(2 x R) for a single loop
B is the field at the centre of the loop in tesla, N is the number of windings around the core, I is the current and R is the radius (not resistance).
m[sub]0[/sub] is the permeability of free space and is constant (look it up 😀 hint: it is around 1 x 10[sup]-6[/sup])
In a solenoid the equation reduces to
B = m[sub]0[/sub] x n x I where n is the number of loops per metre
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u guys have good ideas,
but one idea just struck me, u can correct me if i m wrong, i m open to criticism!
how abt having a cube, with approx 4 cm edge,
at left 4 corners, we have South poles of 4 different magnets, and right 4 corners, we have North poles of 4 different magnets,
Now, we place a magnet bar in the middle of the cube(in the air) such that North Pole of it is pointing to right of the cube, whilst the South pole of the bar, pointing to the left of the cube.
Thus, by the repulsion of the North-North poles(and south-south poles) it'll stay in the air stable, appearing as if it's avoiding the gravitational force of the Earth!
whatcha think!?
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Aiaiai...
Think about it. How many sides does a cube have? How many poles does a magnet have? How do you get a resultant if the magnetic forces cancel out? How do you account for gravity?
Perpetual motion does not exist!!!
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Your idea is to make the resultant force equal to mg right? Even so, when come to making the real product, do you have confident in making a cube that have the perfect shape and getting magnetic bar that produce magnetic force identical to each other? Thing may be easy if looking it in a theoritically way but when come to making real product you may have trouble in balancing the magnet at the middle. Correct me if i am wrong.
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@chuackl, limestone
Lets assume we can make things perfect. But still i guess it wont be able to balance the bar magnet there.
As voltaire said the magnetic forces will cancel out. If we draw the flux lines it seems like the magnet in the center interacts little with them. And so now the only force acting is gravity.
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wats the most use of floating ball....
i think it can be done by magnetic repulsion actions like in magnetic trains...
it can be done by using a circular hollow magnet and a magnetic ball or watever u know the remaining part naa... using the permanent magnet we can lift a magnetic ball only if u use iron then u have to do it by using electricity.....
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Voltaire
Aiaiai...
Think about it. How many sides does a cube have? How many poles does a magnet have? How do you get a resultant if the magnetic forces cancel out? How do you account for gravity?
Perpetual motion does not exist!!!
It is possible to practically implement this in 3-D world, if that's what 're asking. A cube has 6 sides, and 8 corners...so if we take 8 magnets, On the left 4 corners we place the south poles of 4 different magnets(their north poles r left outside the cube, we don't care) and on the right 4 corners we place north poles of remaining 4 magnets(their south poles r left outside the cube, we don't care)
And i do realise that earth will pull the magnet bar downwards, BUT at the bottom 4 corners, there's magnetic repulsion force upwards if u apply reasoning...since there r 2 south poles at 2 left bottom corners repelling the south pole of magnet bar, upwards(and same for north pole from the 2 right bottom corners)
i'll give u an analogy to this one,
imagine a table, the flat surface is getting pulled downwards, by earth's gravity, but it doesn't touch the ground coz it's supported by 4 legs(at 4 corners!) which, according to newton's 3rd law of motion, all 4 legs push the flat surface of table upwards(or against the direction of the gravity of the earth).
in my context of magnet bar in a cube, the only difference is, the 4 legs are magetic forces and "intangible", this indirectly means that the magnet bar didn't touch the ground, it's still in the space(air) "floating"!
whatcha say!?
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I have got a doubt here. Limestone, lets assume things work as you said. That is, no cancelling of forces. In that case, we cant use use all the 8 magnets of same flux density. If the whole thing happens in a gravity less place, then all magnets should be of same power. But here we have an extra force acting downwards - gravity. Considering that, we have to use more powerful magnets at the bottom 4 corners (2 south & 2 north). Only if things work as you said.
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will the circular magnets have poles in wich direction....... i mean if the inner circle got the same pole they have to repel right????????
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lal
Member •
Aug 10, 2010
In circular magnets (which I have dealt with😉), the poles are the flat surfaces. That is, if one flat surface is north the other flat surface is south pole.
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if the magnet with flat surface is there the ball cannot be floating i supose... coz the top portion of the main circular magnet attracts it..... doesn't it......
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lal
Member •
Aug 12, 2010
Yes, the ball will not be floating. It would be attracted downwards. Its because all things always try to take the most stable position.
Here the ball can be made to float if we place it over the circular magnet with extreme precision. And everything must be symmetrical with no ecternal forces other than gravity perpendicularly downwards. But this is practically impossible. Hence normally the ball will get attracted towards the circular magnet.
There is another chance to make a circular magnet float. Take two cicrularmagnets, put a stick through the center hole of one magnet. It is resting on the ground. Now the second magnet is put over the first one (with stick in the hole) such that the similar poles are facing each other. You see the second one floating. Its fun with it. Try it.
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That is why you need a superconductor - because it repels magnetism
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HRG
Member •
Aug 17, 2010
hi friends!
Thank you very much for the interesting replies !!😛
is there any way to decrease and increase the repulsion or attraction forces in a magnet !!!!!😒😁
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Yah it is there no if u use electric coils instead of magnets u can increase or decrease the Magnetic power....
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lal
Member •
Aug 18, 2010
As far as permanent magnets are concerned, their power remains a constant. It is lost by ageing, severe shocks or by heating. So varying the flux produced is not possible.
Here an electromagnet gets handy. The flux generated by it can be easily varied by varying the current through it. The flux is proportional to current. This has a lot of applications in dc machines. By varying the flux, controlling the speed of a motor and generated emf in a generator are easy.
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