Bending magnets

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Offline DoctorBeaver

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Bending magnets
« on: 03/12/2005 00:56:35 »
Take a bar magnet & bend it into a circle, then weld the 2 ends together with a conductive material. What would happen? Would it still be a magnet? And where would the north & south poles be?
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Offline ukmicky

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Re: Bending magnets
« Reply #1 on: 03/12/2005 01:01:22 »
it would just become a round magnet, and the poles would be on the flat sides.

ha! That didnt last long...i'm good at the easy one's[:D]
Michael                                      
« Last Edit: 03/12/2005 01:08:44 by ukmicky »

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Offline daveshorts

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Re: Bending magnets
« Reply #2 on: 03/12/2005 01:22:31 »
No it wouldn't it would be a loop of continuously magnetised stuff. There wouldn't be poles as such, and if you made the loop right there would be no field leaking out of the loop. This is what you are trying to achieve with a toroidal transformer temporarily - the voltage being proportional to the rate of change of magnetisation (or whatever H is called). Any leaking field makes the transformer less efficient.

 If the magnetisation is constant it would have almost no effect on anything outside the loop, except quantum mechanical wave functions whose phase will change depending on which way round the loop they go, producing interference effects. I used to work on superconducting sensors working on this effect.

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Offline ukmicky

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Re: Bending magnets
« Reply #3 on: 03/12/2005 01:31:05 »
[:(]

Michael                                      

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Offline DoctorBeaver

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Re: Bending magnets
« Reply #4 on: 03/12/2005 01:38:51 »
*points & laughs at Micky* Hah... that shut you up! [^]

quote:
No it wouldn't it would be a loop of continuously magnetised stuff. There wouldn't be poles as such, and if you made the loop right there would be no field leaking out of the loop


But would it still act as a magnet?
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Offline ukmicky

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Re: Bending magnets
« Reply #5 on: 03/12/2005 01:41:37 »
I thought i was so clever [:D]

Michael                                      

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Offline DoctorBeaver

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Re: Bending magnets
« Reply #6 on: 04/12/2005 02:43:15 »
Wrong
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Offline ukmicky

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Re: Bending magnets
« Reply #7 on: 04/12/2005 02:53:23 »
What can i say i'm not perfect.

Michael