Effect of Magnetic Fields in Water?

In summary: I think it's called antiferromagnetic. Anyway, I'm not very familiar with MHD, so I can't really help with your question about the magnet effect on water.
  • #1
taylaron
Gold Member
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1
I'm interested in doing a project that involves submerging a very strong if not supercooled electromagnet in water; I'm concerned about the effect of the EM field on the water itself.
I know a bit about Magneto Hydro Dynamics but i don't have the math skills to understand it entirely. college freshman and all.
I understand that when you insert a magnetic field of a certain form (involving charged plates etc...) into water with current running through both the plates and the water, the water will follow the field lines; is this correct?

So my questions:
1. Does the EM field from an insulated EM coil interact with water alone (no current passing through it)?
2. Does the EM field from an insulated EM coil interact with water which has a current running through it?

Answers do not need to go incredibly deep into MHD because what I'm doing does not deal directly with MHD. I'm concerned about the possible side effects it may generate.

Thanks-
Tay
 
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  • #2
What's a supercooled electromagnet?
 
  • #3
The magnetic field won't have any effect on the water but if the magnet is "supercool" it might freeze it.

The effect you describe is easy to do with Neodymium magnets.
You have to have water with salt in it so that it conducts.

You then get the motor effect where you have a current moving in a magnetic field and this produces movement in the water. The water is just like the wire in a magnetic field.

It can be done with a Petrie dish and magnets above and below it. Probes in the water provide the electric current and movement of the water is seen by the turbulence in the water.

Fleming's Left Hand Rule predicts the direction of water flow.

But without electric currents in the water you won't see any effect.
 
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  • #4
Ok, Thanks vk6kro.
Phrak- a 'supercooled' magnet is a magnetic superconductor. it is commonly chilled to temperatures as low as that of liquid nitrogen or liquid Helium. The advantage is that when they are superconductors (super cold) the level of resistance drops dramatically, allowing an enormous amount of power to flow through the wires which would normally cause the wire to melt or vaporize. the supercooled magnet still generates heat, but it is often minuscule. Google 'super conducting magnets'. they are often used in particle accelerators.

-Tay
 
  • #5
taylaron said:
Ok, Thanks vk6kro.
Phrak- a 'supercooled' magnet is a magnetic superconductor. it is commonly chilled to temperatures as low as that of liquid nitrogen or liquid Helium. The advantage is that when they are superconductors (super cold) the level of resistance drops dramatically, allowing an enormous amount of power to flow through the wires which would normally cause the wire to melt or vaporize. the supercooled magnet still generates heat, but it is often minuscule. Google 'super conducting magnets'. they are often used in particle accelerators.

-Tay

OK.

Pure water is diamagnetic. It generates a field that opposes the applied magnetic field. It's substancially weaker than the usual forces associated with ferromagnetic materials by a few orders of magnitude.
 
  • #6
Diamagnetic is a new term for me, so let me get this straight:

if I had an insulated super cooled electromagnetic coil submerged in pure liquid water, the magnetic field would push the water away from the magnet? that doesn't make sense.
What about salt-water?

The ends of the coil are where it gets interesting it seems. Would the water displace itself there because of the extreme repulsive force of the magnet and the diamagnetic water?
I'm probably wrong, but straighten me out.
 
  • #7
taylaron said:
Diamagnetic is a new term for me, so let me get this straight:

if I had an insulated super cooled electromagnetic coil submerged in pure liquid water, the magnetic field would push the water away from the magnet? that doesn't make sense.
What about salt-water?

The ends of the coil are where it gets interesting it seems. Would the water displace itself there because of the extreme repulsive force of the magnet and the diamagnetic water?
I'm probably wrong, but straighten me out.

Diamagnetism is very weak. It may be disappointing in its weakness. It occurs with a static magnetic field. Adding salt wouldn't change the effect much, that I know of. But salt water, as a conductor, will develop an opposing magnetic field to a changing magnetic field. The salt water acts as though it is a shorted one-turn secondary of a transformer (because it is). This is the same thing as the usual classroom demonstration of a copper ring that is repelled from the end of a high frequency solenoid. Look up Lenz's Law.

If you're interested, google 'diamagnetism'. All in all, there are 4 sorts of magnetic materials: ferromagnetic, diamagnetic, paramagnetic, and one other effect I forget.
 

What is the effect of magnetic fields in water?

The effect of magnetic fields in water is to change the physical and chemical properties of water. When a magnetic field is applied to water, the molecules of water align themselves in a specific direction, leading to changes in surface tension, viscosity, and reactivity.

How does a magnetic field affect the quality of water?

A magnetic field can improve the quality of water by reducing the size of water clusters, making it easier for the body to absorb and increasing its ability to dissolve substances. It can also decrease the presence of harmful bacteria and impurities in water.

Is it safe to drink water that has been exposed to a magnetic field?

Yes, it is safe to drink water that has been exposed to a magnetic field. The magnetic field does not add or remove any substances from the water, it only changes its physical properties. However, it is important to note that magnetic fields should not be used as the sole method of water purification.

What are the potential benefits of using magnetic fields in water treatment?

Some potential benefits of using magnetic fields in water treatment include improved water quality, increased nutrient absorption, and reduced bacterial growth. It may also have potential applications in agricultural and industrial processes.

Are there any potential risks associated with using magnetic fields in water?

There are no known risks associated with using magnetic fields in water treatment. However, as with any technology, it is important to follow proper protocols and guidelines to ensure safe and effective use. Additionally, more research is needed to fully understand the long-term effects of using magnetic fields in water treatment.

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