| Topic: |
Science > Physics |
| User: |
"CWatters" |
| Date: |
05 Feb 2005 04:30:20 AM |
| Object: |
Magnets near a black hole |
What would happen if you could transport a long bar magnet towards a black
hole. Say one end is pointing at the hole. What happens when that end
approaches the event horizon? Can the other end ever become the monopole
that some crazy folk seem to be chasing?
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| User: "Uncle Al" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 10:57:10 AM |
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CWatters wrote:
What would happen if you could transport a long bar magnet towards a black
hole. Say one end is pointing at the hole. What happens when that end
approaches the event horizon? Can the other end ever become the monopole
that some crazy folk seem to be chasing?
How do you get *anything* across a black hole event horizon as viewed
from the outside? It redshifts to infinity as it asymptotically
approaches the event horizon as viewed by an external observer.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "CWatters" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 03:52:33 PM |
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"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:4204FAE5.843ED374@hate.spam.net...
CWatters wrote:
What would happen if you could transport a long bar magnet towards a
black
hole. Say one end is pointing at the hole. What happens when that end
approaches the event horizon? Can the other end ever become the monopole
that some crazy folk seem to be chasing?
How do you get *anything* across a black hole event horizon as viewed
from the outside? It redshifts to infinity as it asymptotically
approaches the event horizon as viewed by an external observer.
Does that mean it doesn't cross or does it just disappear (from the visable
spectrum) so you can't see it cross?
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| User: "Ben Rudiak-Gould" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 04:53:29 PM |
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CWatters wrote:
"Uncle Al" <UncleAl0@hate.spam.net> wrote:
How do you get *anything* across a black hole event horizon as viewed
from the outside? It redshifts to infinity as it asymptotically
approaches the event horizon as viewed by an external observer.
Does that mean it doesn't cross or does it just disappear (from the visable
spectrum) so you can't see it cross?
Certainly the latter. There's a well-defined point in spacetime at which the
first bit of magnet crosses the event horizon, even if you will, by
definition, never see it happen (provided you stay outside).
On the other hand the tension on the end of the magnet will go to infinity
as it approaches the event horizon, meaning that it'll necessarily break at
some point *above* the e.h., and you will see that happen. After which
you'll be dangling a broken magnet just above the event horizon of a black
hole, and if that's not bad enough, I'm pretty sure it'll be a dipole.
-- Ben
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| User: "tj Frazir" |
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| Title: Re: Magnets near a black hole |
06 Feb 2005 10:25:39 AM |
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No more magnet.
The low the parts of the atom orbit G will be as low outside the atom
as inside and so all the parts orbit the black hole instead of the
center of the atom.
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| User: "Sam Wormley" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 05:57:03 AM |
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CWatters wrote:
What would happen if you could transport a long bar magnet towards a black
hole. Say one end is pointing at the hole. What happens when that end
approaches the event horizon? Can the other end ever become the monopole
that some crazy folk seem to be chasing?
Magnet fall behind the event horizon--no information is available.
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| User: "CWatters" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 10:16:23 AM |
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"Sam Wormley" <swormley1@mchsi.com> wrote in message
news:jw2Nd.49488$IV5.32158@attbi_s54...
CWatters wrote:
What would happen if you could transport a long bar magnet towards a
black
hole. Say one end is pointing at the hole. What happens when that end
approaches the event horizon? Can the other end ever become the monopole
that some crazy folk seem to be chasing?
Magnet fall behind the event horizon--no information is available.
So the whole magnet somehow crosses the horizon at the same time?
Is not possible to have one end of the magnet inside and the other outside
even if only for an instant?
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| User: "G=EMC^2 Glazier" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 08:08:55 AM |
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Hi CWaters the magnet end pointed,and going though the BH event horizon
would be stretched out like spaghetti as the BH gravity effects the
front much greater than the bar magnets back end Being an iron magnet
does not make any difference. One thing the BH and the bar magnet have
in common they create force,and their forces go to infinity. However the
magnetic force once inside a BH can't get out. Bert.
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| User: "CWatters" |
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| Title: Re: Magnets near a black hole |
06 Feb 2005 02:20:49 AM |
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"G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
news:11260-4204D377-230@storefull-3172.bay.webtv.net...
Hi CWaters the magnet end pointed,and going though the BH event horizon
would be stretched out like spaghetti as the BH gravity effects the
front much greater than the bar magnets back end Being an iron magnet
does not make any difference. One thing the BH and the bar magnet have
in common they create force,and their forces go to infinity. However the
magnetic force once inside a BH can't get out. Bert.
That's my understanding. The diagrams I've seen for a bar magnet show the
field lines curving around like this...
http://www.sunblock99.org.uk/sb99/people/DMackay/magnetic.html
What would the field lines look like with one end in a BH? or do they stop
the moment one end is at/in the horizon? Perhaps they are too far distorted
before the magnet gets that close?
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| User: "Eric Gisse" |
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| Title: Re: Magnets near a black hole |
05 Feb 2005 07:34:38 AM |
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Sam Wormley wrote:
CWatters wrote:
What would happen if you could transport a long bar magnet towards
a black
hole. Say one end is pointing at the hole. What happens when that
end
approaches the event horizon? Can the other end ever become the
monopole
that some crazy folk seem to be chasing?
Magnet fall behind the event horizon--no information is available.
How about an electron?
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