I just tried the same test on a piece aluminum and copper with a rare earth magnet and it acts the same way as on a piece of silver you need to back it up with a specific gravity test.
An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux. This is not only applicable to silver.
Magnetic field crosses the metal, inducing a current. The resultant magnetic field produced from that current opposes the movement of the magnetic field and hence the magnet. A mini electrical generator . This works with any electrical conductor whatsoever, but to varying degrees. The effect is strongest with silver as it's lower bulk resistance gives rise to more current, hence more opposing magnetic field for longer. So to be sure, you need to use this effect under tightly controlled conditions. Look up "eddy current" for more explanation. If you already know how a magnet interacts with a bar of certain geometry, it can still be a useful rough and ready test and very importantly, those magnetic fields can penetrate deep into the silver.
Unfortunately, this is not an accurate way of testing silver... If you observe the periodic table you will find that Cu (Copper) is directly above Ag (Silver), which tells us that they share similar properties... Additionally, this EXACT same thing will happen with Cu. So if an enterprising thief were to simply plate Cu with Ag, this test would never know the difference, and it would behave exactly the same. There is no fool-proof way to test precious metals, other than cutting them in half... Sorry folks. :-(
Silver Money .999 Well, even the specific gravity test can be faked (although thank you for reminding me!), for example, Tungsten and Gold have a very similar SG, so although I did say 'cut them in half' as being the only way, if you go through multiple tests, the magnet test, SG, weight, and the 'Ice Test', you should be able to verify that the silver in question is not only real, pure silver, but if it has a false core or not (mostly the ice test will verify this, if it is pure silver the ice will melt *almost* instantly, as if on a hot surface)... There are some other tests, but they are more surface tests that can't identify if it is silver throughout... I am sure that I have forgotten another test or two, I tend to be forgetful about such things... :-)
Just to inform you gold is the best known electricity conductor to man kind next to that is silver then copper all these elements are used is today's electronics.. earth magnets have the same effects on all these elements. We don't use allot of gold or silver in electronics because of their values. Cost to much. So instead we use copper which is cheaper and Zink in which we gold plate or silver plate them still get almost the same conduction.. I can make a copper bar and multi plate it with gold or silver and get the same effect as your test. I suggest taking your bar in and test it. even a laser only reads the surface. Have your bar drilled in 2 locations center and 1/4 of an inch from corner of the bar.. why? Because even some ppl will go as far as filling certain areas of the bar with copper and selling it at full value.
This is not a test for purity of any metal. The sliding of the magnet induces currents in the metal that oppose the motion of the magnet, thus slowing it down. Try dropping a round magnet through a copper or aluminium pipe and this effect will be seen to slow the magnet to a gentle float as it drops.
Not one of Avis's better videos. Many discrepancies in what he's saying. The real kicker was when he was showing the magnet slide off the green metal box....but the magnet was upside down!!! So it would not have any magnetic pull.
Hi there, Since copper is also diamagnetic, if the bar was silver plated over copper would it not present the same as a solid silver bar?
I just tried the same test on a piece aluminum and copper with a rare earth magnet and it acts the same way as on a piece of silver you need to back it up with a specific gravity test.
It's called paramagnetic. Copper has the same property and the magnet will slide just as slow
i find using specific gravity more effective then the magnet test.
Thanks for the informative video. I learned a lot of useful information.
Again, THANKS!!!!!
I found this video very informative. Thank you.
You shouldn't
By the way, Home Depot sells neodymium magnets in the hardware section right next to all the nuts, bolts and screws
An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the original change in magnetic flux. This is not only applicable to silver.
Magnetic field crosses the metal, inducing a current. The resultant magnetic field produced from that current opposes the movement of the magnetic field and hence the magnet. A mini electrical generator . This works with any electrical conductor whatsoever, but to varying degrees. The effect is strongest with silver as it's lower bulk resistance gives rise to more current, hence more opposing magnetic field for longer. So to be sure, you need to use this effect under tightly controlled conditions. Look up "eddy current" for more explanation.
If you already know how a magnet interacts with a bar of certain geometry, it can still be a useful rough and ready test and very importantly, those magnetic fields can penetrate deep into the silver.
thanks Avi great video
the magnet will do the same thing with copper and aluminum
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copper behaves the exact same way as silver with the neodymium metals, so this can not distinguish silver from plated copper
What about gold?
Unfortunately, this is not an accurate way of testing silver... If you observe the periodic table you will find that Cu (Copper) is directly above Ag (Silver), which tells us that they share similar properties... Additionally, this EXACT same thing will happen with Cu. So if an enterprising thief were to simply plate Cu with Ag, this test would never know the difference, and it would behave exactly the same.
There is no fool-proof way to test precious metals, other than cutting them in half... Sorry folks. :-(
Silver Money .999 Well, even the specific gravity test can be faked (although thank you for reminding me!), for example, Tungsten and Gold have a very similar SG, so although I did say 'cut them in half' as being the only way, if you go through multiple tests, the magnet test, SG, weight, and the 'Ice Test', you should be able to verify that the silver in question is not only real, pure silver, but if it has a false core or not (mostly the ice test will verify this, if it is pure silver the ice will melt *almost* instantly, as if on a hot surface)... There are some other tests, but they are more surface tests that can't identify if it is silver throughout... I am sure that I have forgotten another test or two, I tend to be forgetful about such things... :-)
but specific gravity...
Just to inform you gold is the best known electricity conductor to man kind next to that is silver then copper all these elements are used is today's electronics.. earth magnets have the same effects on all these elements. We don't use allot of gold or silver in electronics because of their values. Cost to much. So instead we use copper which is cheaper and Zink in which we gold plate or silver plate them still get almost the same conduction.. I can make a copper bar and multi plate it with gold or silver and get the same effect as your test. I suggest taking your bar in and test it. even a laser only reads the surface. Have your bar drilled in 2 locations center and 1/4 of an inch from corner of the bar.. why? Because even some ppl will go as far as filling certain areas of the bar with copper and selling it at full value.
Silver platter 👍
This is not a test for purity of any metal. The sliding of the magnet induces currents in the metal that oppose the motion of the magnet, thus slowing it down. Try dropping a round magnet through a copper or aluminium pipe and this effect will be seen to slow the magnet to a gentle float as it drops.
Not one of Avis's better videos. Many discrepancies in what he's saying. The real kicker was when he was showing the magnet slide off the green metal box....but the magnet was upside down!!! So it would not have any magnetic pull.
Don't listen to this guy, aluminum and copper react the same
but density is different.
This guy, 'it'll melt like an egg in a frying pan'
How will an egg melt in a fucking hot pan
+hellyeah66613 xD I know right that's what I was thinking bro!
If silver is the best conductor of electricity then why do they use gold in everything...?
Troy Stutsman because it oxidizes and loses conductivity over time...
Hi Avi, I have sent you a message one week back regarding selling me one of these bars, could you please check your TH-cam messaging folder.
If it’s pure silver the neodymium magnet should slide off fast. Not slow. 🤦♂️
Wow he actually said "Back to the Topic".... 30 sec video.... drawn out shit... and no that is not 100%.....
Avi bekitser !
Woah
you don't want to talk too much about the coins because you have no idea what they are lol. those are maple leafs not rounds..
Poor guy, he got a lot of shit wrong. False statements and inaccuracies. Just shows a little knowledge is a dangerous thing.
Unfortunately, copper is diamagnetic as well.