| Topic: |
Science > Physics |
| User: |
"chuckles" |
| Date: |
23 Sep 2006 05:16:40 PM |
| Object: |
Is magnetism conductive? |
Hi guys,
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
.
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| User: "Sorcerer" |
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| Title: Re: Is magnetism conductive? |
23 Sep 2006 06:43:21 PM |
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"chuckles" <chuckleberryfinn@gmail.com> wrote in message
news:1159049800.299955.159020@b28g2000cwb.googlegroups.com...
| Hi guys,
| I have a small magnet on my pc desk I play with while I'm working. I
| was playing with the magnet and some lose change when I noticed for the
| first time, I'm not very observant, once one piece of change was
| attached to the magnet it, the coin, becomes (a slightly weaker?)
| magnet. Is magnetism conductive?
Yes. And your coin is a dud. Machines which take money
have magnets to eliminate washers and blanks from industrial
presses designed to punch holes.
It is very easy to magnetize a steel sewing needle by stroking it
with a magnet, and you can then take a saucer of water, drip
some hot wax from a candle on the water and gently drop the
needle on the wax so that it floats. The needle will then align
itself North. You can also permanently magnetize the shadow
mask of your TV or monitor and the result will be colour
impurity. Also if I were you I'd not place it near any floppy
disks, although they are not used much anymore.
Androcles, now a saucerer as well as a sorcerer.
.
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| User: "" |
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| Title: Re: Is magnetism conductive? |
24 Sep 2006 01:19:25 AM |
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Sorcerer wrote:
"chuckles" <chuckleberryfinn@gmail.com> wrote in message
| I have a small magnet... once one piece of change was
| attached to the magnet it, the coin, becomes (a slightly weaker?)
| magnet. Is magnetism conductive?
Yes. And your coin is a dud.
Canadian dimes are nearly pure nickel (not copper/nickel like US
fivecent pieces)
and are ferromagnetic. Slightly, as compared to the WWII-era steel
cent pieces,
but still magnetic. The coin could be fine currency, as solid as the
permafrost...
In the Faraday picture, a permanent magnet generates lines of force; a
soft magnetic
material offers a conductor for those magnetic lines (which were called
'flux' because
it was thought they were flow of some kind of current). But, people
don't much use the
Faraday picture of magnetism nowadays. The vector-field picture says
the
external field adjusts to minimum stored energy by redistributing in
the presence of
a magnetic materlal... and the minimum stored energy is when the
permanent magnet
is near the magnetic material (i.e. magnets attract magnetic stuff).
The redistribution will
usually lower B in most parts of space (because low B means low field
energy).
.
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| User: "Sorcerer" |
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| Title: Re: Is magnetism conductive? |
24 Sep 2006 03:54:10 AM |
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<whit3rd@gmail.com> wrote in message
news:1159078765.164776.67540@i3g2000cwc.googlegroups.com...
|
| Sorcerer wrote:
| > "chuckles" <chuckleberryfinn@gmail.com> wrote in message
|
| > | I have a small magnet... once one piece of change was
| > | attached to the magnet it, the coin, becomes (a slightly weaker?)
| > | magnet. Is magnetism conductive?
| >
| > Yes. And your coin is a dud.
|
Canadian dimes are nearly pure nickel (not copper/nickel like US
fivecent pieces)
and are ferromagnetic
Oh dear, you snipped. What were you saying? "Ferrous" means what, exactly?
New Latin ferrosus, from Latin ferrum
1 : of, relating to, or containing iron
2 : being or containing divalent iron
Androcles
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| User: "Timo A. Nieminen" |
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| Title: Re: Is magnetism conductive? |
23 Sep 2006 08:18:49 PM |
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|
On Sun, 23 Sep 2006, chuckles wrote:
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
The correct technical terminology would be "the magnet induces a magnetic
polarisation in the coin", but, yes, your observation is correct. The
original magnet doesn't get any weaker, and usually the coin or other
object loses all (or at least most) of its magnetism when moved away.
First known report of this observation was by Saint Augustine of Hippo.
--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
.
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| User: "chuckles" |
|
| Title: Re: Is magnetism conductive? |
23 Sep 2006 05:19:55 PM |
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chuckles wrote:
Hi guys,
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
I'm interested in Physics but have absolutely no background in it but
I'll attempt to make my question sound slightly less ignorant. Is the
magnetic field encompassing the coin or does the coin generate its own
magentic field?
.
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| User: "G=EMC^2 Glazier" |
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| Title: Re: Is magnetism conductive? |
24 Sep 2006 08:37:03 AM |
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Chuckles I'm chuckling,because my USA change is not effected by a
permanent magnet. Magnetisim and electricity are two sides to the same
coin.To make an electric current to move it takes a conductor. For the
most part copper wire is used. Interesting stainless steal is not
effected by a magnet. A mouse can be levitated so that means there is a
magnetic force in just about every thing. Man has improved the pull of
two magnets by giving them a "horseshoe shape" The curved lines of
force showing the direction of the field( magnetic) helps my "Spin is in
Theory" to show how attraction over distance is taking place, Bert
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| User: "" |
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| Title: Re: Is magnetism conductive? |
23 Sep 2006 05:25:47 PM |
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In article <1159049994.959978.224350@i42g2000cwa.googlegroups.com>, "chuckles" <chuckleberryfinn@gmail.com> writes:
chuckles wrote:
Hi guys,
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
I'm interested in Physics but have absolutely no background in it but
I'll attempt to make my question sound slightly less ignorant. Is the
magnetic field encompassing the coin or does the coin generate its own
magentic field?
The coin got magnetized. An object containing ferromagnetic material,
when placed in a magnetic field, becomes magnetized and from this
point on it generates its own field.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
.
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| User: "chuckles" |
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| Title: Re: Is magnetism conductive? |
23 Sep 2006 05:31:56 PM |
|
|
wrote:
In article <1159049994.959978.224350@i42g2000cwa.googlegroups.com>, "chuckles" <chuckleberryfinn@gmail.com> writes:
chuckles wrote:
Hi guys,
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
I'm interested in Physics but have absolutely no background in it but
I'll attempt to make my question sound slightly less ignorant. Is the
magnetic field encompassing the coin or does the coin generate its own
magentic field?
The coin got magnetized. An object containing ferromagnetic material,
when placed in a magnetic field, becomes magnetized and from this
point on it generates its own field.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
Thank you very much, is the field generated by the coin equivalent to
the field generated by the original magnet? Is the size of the field
generated by the coin proportional to the amount of ferromagnetic
material in the coin? Why is it weaker?
Thanks again.
.
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| User: "" |
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| Title: Re: Is magnetism conductive? |
23 Sep 2006 06:35:36 PM |
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In article <1159050716.530277.219870@e3g2000cwe.googlegroups.com>, "chuckles" <chuckleberryfinn@gmail.com> writes:
mme...@cars3.uchicago.edu wrote:
In article <1159049994.959978.224350@i42g2000cwa.googlegroups.com>, "chuckles" <chuckleberryfinn@gmail.com> writes:
chuckles wrote:
Hi guys,
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
I'm interested in Physics but have absolutely no background in it but
I'll attempt to make my question sound slightly less ignorant. Is the
magnetic field encompassing the coin or does the coin generate its own
magentic field?
The coin got magnetized. An object containing ferromagnetic material,
when placed in a magnetic field, becomes magnetized and from this
point on it generates its own field.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
Thank you very much, is the field generated by the coin equivalent to
the field generated by the original magnet?
I'm not sure what you mean by "equivalent". It is related to the
original field.
Is the size of the field
generated by the coin proportional to the amount of ferromagnetic
material in the coin?
Both to the amount of ferromagnetic material and to the magnetizing
field to which it was subjected (i.e. the field of the original
magnet).
Why is it weaker?
At the extreme it may be nearly the same, but not stronger, since the
coin will not get magnetized to higher extent then the original
magnet was. If there is just a bit of ferromagnetic material in the
coin, its field will be much weaker.
Thanks again.
You're welcome.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
.
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| User: "J. Horta" |
|
| Title: Re: Is magnetism conductive? |
23 Sep 2006 06:22:31 PM |
|
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On Sat, 23 Sep 2006 15:31:56 -0700, chuckles wrote:
mme...@cars3.uchicago.edu wrote:
In article <1159049994.959978.224350@i42g2000cwa.googlegroups.com>, "chuckles" <chuckleberryfinn@gmail.com> writes:
chuckles wrote:
Hi guys,
I have a small magnet on my pc desk I play with while I'm working. I
was playing with the magnet and some lose change when I noticed for the
first time, I'm not very observant, once one piece of change was
attached to the magnet it, the coin, becomes (a slightly weaker?)
magnet. Is magnetism conductive?
I'm interested in Physics but have absolutely no background in it but
I'll attempt to make my question sound slightly less ignorant. Is the
magnetic field encompassing the coin or does the coin generate its own
magentic field?
The coin got magnetized. An object containing ferromagnetic material,
when placed in a magnetic field, becomes magnetized and from this
point on it generates its own field.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
Thank you very much, is the field generated by the coin equivalent to
the field generated by the original magnet? Is the size of the field
generated by the coin proportional to the amount of ferromagnetic
material in the coin? Why is it weaker?
There is a reasonably good mathematical analogy between magnetic flux
and current flow. This mangentic flux flows out one pole face and into
the other (you can think of the magnet as a battery supplying flux instead
of current) When the first coin is placed across the poles the flux
of the magnet is shorted out somewhat by the coin since the coin is
a better conductor of flux than space is.
Thanks again.
.
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