Could I use electro magnets to repulse the earths magnetic field to levitate?

smartperson

I have this idea that I could use some electromagents that wen I run current through will repulse the earths magnetic field and that the higher voltage(or whatever electrical unti I decide to use) would send and object farther away from the ground and that the lower current would bring it closer to the ground.

I really have no idea if it would work but it sems to me that it would.

If it works, which hoefully it will it could be in theory used to make a suit that would let a person levitate.

Infinitum

Earth's magnetic field is not perpendicular to the ground, so the person can't be lifted vertically upwards. You would move towards one of the poles, depending on where you are. Also, the earth's field is quite weak, and there is magnetic disturbance from various objects which sometimes exceed earth's intensity, meaning you would require a really really really strong magnet for any movement(and you might not like towards where the movement would be)

smartperson

So if I had a magnet powerful enough I would really be able to only go in one direction?

Drakkith

The idea is simply not feasible due to the extremely weak magnetic field of the Earth. (compared to what conventional or superconducting electromagnets can do)

kmarinas86

http://en.wikipedia.org/wiki/File:Sc...nt-systems.png

"Could I use electro magnets to repulse the earths magnetic field to levitate?" It is safe to say that Pederson currents levitate, in a restricted sense.

smartperson

I see. So if I was in the Pederson current area it might work with the right technoloy? But its a shame I dont live in Greenland. I'd have to use the Hall currents.

K^2

There's a field gradient, so in principle, yes, you could levitate something in Earth's magnetic field. Trouble is, you need very strong electromagnets for that, and they'll end up being far heavier than what you could lift with them. The Earth's magnetic field is simply not strong enough for this to work in practice.

willem2

The problem is that a magnetic dipole in a uniform field won't feel a net force at all, but only a torque that will align it with the field. The magnetic field of the earth is uniform to a very high accuracy on the scale of any magnet you would use.

Pedersen currents are made up of charged particles, these will feel a net force in a uniform magnetic field.

smartperson

I see. What if I didnt use the Earths magnetic field, mabey the Sun's? it seems powerful enough to work.

Thundagere

Remember that magnetic field varies with distance. THe sun is probably not the best idea for this reason.

Drakkith

The average strength of the Sun's magnetic field at its surface is only 1 gauss, which is about twice what Earth's magnetic field is on it's surface. This falls off drastically by the time the magnetic field reaches us.

mfb

In addition, the field gradient falls off even quicker than the field itself. While the magnetic field of the earth is strong enough to have some measurable influence, the variation in its strength is extremely low within interesting distances (~1m).

If you have access to some stronger magnets on the ground (or some other devices), it is possible to levitate objects with a lot of different methods.

smartperson

So there is really no possible way this could work? Without the right technology that would be to heavy anyways?

swampwiz

You could build a device that could create a *tremendous* current, which if flowing through a coil could produce a magnetic moment that if aligned in a certain way relative to the Earth's magnetic field (i.e., for that particular location) would produce a torque, which you could then via mechanical levering use to lift something up - but it would need some sort of an axle to rotate, so it could not simply levitate in the air.

Robin07

I'm entertaining the idea that it is possible to 'move away from the Earth'. If I understand this correctely? You would need to increase ones mass relative to Earth, your weight stays unchanged. Your levitating device/medium/platform would also need to be perpendicular to Earths guass field. To ballance your craft, alternate the.... I'll continue in the next post, pending results.