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I Think I'm Going To Be Mad.

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cmdrstp's Avatar
United States
113 Posts
 Posted 11/04/2009  7:01 pm Show Profile   Bookmark this topic Add cmdrstp to your friends list Get a Link to this Message Number of Subscribers
I just received my neodymium magnet in the mail today. A small but, strong one (N52). I bought to check for counterfeits. Well, I have three ASE bullion (from a coin shop) and all of them were moved when the magnet was waved over them. They didn't adhere but, they were affected with slight movement. I have NGC certified one but, I can't use it to compare as you know it is firmly encased. I don't have a scale or calipers yet. I don't think I should see any movement. True?

Thank you.

Stephen
Edited by cmdrstp
11/04/2009 7:05 pm
Valued Member
cmdrstp's Avatar
United States
113 Posts
 Posted 11/04/2009  7:22 pm  Show Profile   Bookmark this reply Add cmdrstp to your friends list Get a Link to this Reply
If it matters....when I wave the magnet slowly, no movement. When I pass over it back and forth fast, movement.
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Sap's Avatar
Australia
16874 Posts
 Posted 11/04/2009  7:39 pm  Show Profile   Bookmark this reply Add Sap to your friends list Get a Link to this Reply
If it doesn't "stick", then it's not ferromagnetic - that is, it's not made of iron, cobalt, nickel, certain scarce elements not likely to be used in coinage either genuine or fake, or an alloy containing a large proportion of those elements.

It's a myth that other metals won't react at all to a magnetic field; most substances, including silver, are diamagnetic" and are actually repelled slightly by a magnetic field, though it has to be a very powerful magnet to see any kind of effect. This could explain the effect you're seeing.

Your neodymium magnet was perhaps a bit of an overkill.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Valued Member
cmdrstp's Avatar
United States
113 Posts
 Posted 11/04/2009  7:52 pm  Show Profile   Bookmark this reply Add cmdrstp to your friends list Get a Link to this Reply
"repelled slightly by a magnetic field, though it has to be a very powerful magnet to see any kind of effect."

That is exactly what I am seeing. A repel action. This magnet is the size of 5 stacked dimes and it is very strong! Takes quite some force to remove from the frig and keep from slamming into it.

I have also test this magnet on ALL my coins (pennies, dimes, nickels, old and new, and, if the friction is kept low, I produce the same effects. Always a repelling movement. Interesting.

I did think the strong magnet created some field that might influence the 0.07% of Cu or Au itself. But, I wanted to be sure. And, you made me feel better. Thank you.

What type of magnets do you recommend? I read you needed a "strong" magnet to test with.
Edited by cmdrstp
11/04/2009 8:11 pm
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DVCollector's Avatar
United States
10045 Posts
 Posted 11/04/2009  10:06 pm  Show Profile   Bookmark this reply Add DVCollector to your friends list Get a Link to this Reply
I think there is a diamagnetic effect with silver, where it creates its own magnetic field opposing an external field. Oops...you guys beat me to it!
I don't have any neodymium magnets to check. Test that magnet against a larger melt silver coin such as a Morgan and see what happens.

Quote:
Takes quite some force to remove from the frig and keep from slamming into it.
Yeah...so be careful to not get a finger between two neodymium magnets--bad things happen.
Edited by DVCollector
11/04/2009 10:09 pm
Valued Member
cmdrstp's Avatar
United States
113 Posts
 Posted 11/04/2009  11:18 pm  Show Profile   Bookmark this reply Add cmdrstp to your friends list Get a Link to this Reply
I did test the Morgan. A Peace, too. Same effect.

I couldn't imagine TWO neodymium magnets!

Thank you for the explanation. I thought I had three counterfeit ASEs.
Edited by cmdrstp
11/04/2009 11:28 pm
Valued Member
Brannenworks's Avatar
United States
106 Posts
 Posted 11/06/2009  02:48 am  Show Profile   Bookmark this reply Add Brannenworks to your friends list Get a Link to this Reply
A wonderful teaching moment on magnetism! (I hope I get this right, I'm starting teaching physics at ITT Technical Institute next month, LOL.)

A moving magnetic field creates an electric field, which in a coin, produces a current, which generates a magnetic field. So every metal will react to a magnet moving fast enough.

And thanks for the note, this could be a lab demonstration I could use.
Edited by Brannenworks
11/06/2009 02:49 am
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