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Science and Technology "Somewhere, something incredible is waiting to be known." - Carl Sagan.

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Old March 26 2009, 03:25 PM   #1
All Seeing Eye
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Opposing Magnets Query

When you place two opposing magnets together obviously they will repel each other and you can feel them repelling. Now let's say you take a couple of Neodymium magnets (really strong ones) and you force them together so they are touching each other (obviously the repelling force will be incredible). Now imagine you lock them together like that with some kind of metal bracing so they are forever locked together in repulsion.

Now here is the important part, imagine before you locked them together you cut a bit out of each magnet so there was a tunnel or tubular hole running through the centre and you place within this area a coiled wire.

Would the magnetic fields be continually fluctuating due to magnets being locked together whilst repelling? and would this fluctuation of the magnetic field continually pass back and forth through the coil and thus create electrical current?
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Old March 26 2009, 03:41 PM   #2
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Re: Opposing Magnets Query

no, there would have to be some sort of movement to push the electrons along

we all know the 2nd grade experiments of passing a bar magnet through a coil to produce current

having a static magnet, would do nothing

this is why generator turbines spin, and conversely how electric motors work
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Old March 26 2009, 03:43 PM   #3
All Seeing Eye
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Re: Opposing Magnets Query

Yes I know what you mean but what I am saying is would the magnetic field fluctuate and would it's fluctuation cause the magnetic field to pass through the coiled wire thus creating electrical current.

I know Electricity is created by magnets being physically moved so their magnetic fields pass through the coiled wire but what I am asking is would forcing two opposing magnets together and locking them in that repulsion cause the magnetic field (and not the magnet) to fluctuate and thus move through the coiled wire.
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Old March 26 2009, 03:44 PM   #4
Alpha_Geek
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Re: Opposing Magnets Query

Get a voltmeter, try it, and report the results here.

You can't hurt yourself with this one unless you get your finger caught in a clamp or something equally embarrasing.
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Old March 26 2009, 03:46 PM   #5
All Seeing Eye
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Re: Opposing Magnets Query

I don't have access to Neodymium magnets and I'm talking seriously big ones here so the magnetic fields would have greater repulsion.
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Old March 26 2009, 04:30 PM   #6
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Re: Opposing Magnets Query

Tachyon Shield wrote: View Post
Yes I know what you mean but what I am saying is would the magnetic field fluctuate and would it's fluctuation cause the magnetic field to pass through the coiled wire thus creating electrical current.

I know Electricity is created by magnets being physically moved so their magnetic fields pass through the coiled wire but what I am asking is would forcing two opposing magnets together and locking them in that repulsion cause the magnetic field (and not the magnet) to fluctuate and thus move through the coiled wire.
The magnetic field would not fluctuate, as it would be a static field.

No variation of the electromagnetic field, no current, no work.
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Old March 26 2009, 04:32 PM   #7
Jadzia
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Re: Opposing Magnets Query

Tachyon Shield wrote: View Post
Would the magnetic fields be continually fluctuating due to magnets being locked together whilst repelling? and would this fluctuation of the magnetic field continually pass back and forth through the coil and thus create electrical current?
The fields don't fluctuate. They're static. Electromagnetic induction requires a continuous change in the relationship between the magnetic field and the conductor.

eg, rotating the magnetic field, or changing the area of the coil.
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Old March 26 2009, 05:05 PM   #8
All Seeing Eye
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Re: Opposing Magnets Query

Jadzia wrote: View Post
The fields don't fluctuate. They're static.
Why does nature mock me so?
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Old March 26 2009, 05:21 PM   #9
iguana_tonante
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Re: Opposing Magnets Query

Tachyon Shield wrote: View Post
Jadzia wrote: View Post
The fields don't fluctuate. They're static.
Why does nature mock me so?
Because it's easy.
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Old March 26 2009, 05:23 PM   #10
JustAFriend
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Re: Opposing Magnets Query

Tachyon Shield wrote: View Post
I don't have access to Neodymium magnets and I'm talking seriously big ones here so the magnetic fields would have greater repulsion.
Sure you do.

It's called the Internet. Order some.
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Old March 26 2009, 05:27 PM   #11
All Seeing Eye
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Re: Opposing Magnets Query

JustAFriend wrote: View Post
Tachyon Shield wrote: View Post
I don't have access to Neodymium magnets and I'm talking seriously big ones here so the magnetic fields would have greater repulsion.
Sure you do.

It's called the Internet. Order some.
I don't have access to the sizes i'm talking about and I certainly don't have the money to pay for them at the prices they come at.
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Old March 26 2009, 05:35 PM   #12
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Re: Opposing Magnets Query

Why not use electromagnets? Then you can make the magnetic field fluctuate, and you'll be able to use this to generate a current in your wire coil
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Old March 26 2009, 05:37 PM   #13
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Re: Opposing Magnets Query

that would defeat the purpose by using electricity to make electricity
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Old March 26 2009, 05:40 PM   #14
Jadzia
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Re: Opposing Magnets Query

backstept wrote: View Post
that would defeat the purpose by using electricity to make electricity
I didn't realise that was the purpose; the purpose wasn't stated. I thought it was just a question about magnetic induction
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Old March 26 2009, 05:41 PM   #15
All Seeing Eye
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Re: Opposing Magnets Query

Jadzia wrote: View Post
Why not use electromagnets? Then you can make the magnetic field fluctuate, and you'll be able to use this to generate a current in your wire coil
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