Coin Community Family of Web Sites Join Thousands of Coin, Bullion, & Money Collectors
Join Thousands of Coin, Bullion, & Money Collectors Shop for APMEX Bullion on eBay!Vancouvers #1 Coin and Paper Money Dealer 300,000 items to help build your collection! Specializing in Modern Numismatics Coin, Banknote and Medal Collectors's Online Mall Royal Canadian Mint products, Canadian, Polish, American, and world coins and banknotes.








Username:
Password:
Save Password
Forgot your Password?


This page may contain links that result in small commissions to keep this free site up and running.

Welcome Guest! Registering and/or logging in will remove the anchor (bottom) ads. It's Free!

I Think I'm Going To Be Mad.

To participate in the forum you must log in or register.
Author Previous TopicReplies: 6 / Views: 1,537Next Topic  
Valued Member
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.
Moderator
Learn More...
Sap's Avatar
Australia
16810 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
Bedrock of the Community
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
  Previous TopicReplies: 6 / Views: 1,537Next Topic  

To participate in the forum you must log in or register.



    




Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited.
Contact Us  |  Advertise Here  |  Privacy Policy / Terms of Use

Coin Community Forum © 2005 - 2026 Coin Community Forums
It took 0.22 seconds to rattle this change. Forums