Re: [Phys-L] magnetic field reversals

[Bernard Cleyet <bernard@cleyet.org>]

On 2015, Oct 05, , at 13:13, John Clement <clement@hal-pc.org> wrote:

> Old bar magnets do not hold their
> magnetism very well, so you have to use a magnetizer fairly frequently on
> them.  I would say that mususe of the magnetizer may be a real possibility.
> I did not always have access to a magnetizer so I would carefully use
> ceramic magnets to "refresh" the bar magnets.


antique bars softer than alnico? 

Ceramics very approximately 5X alnico.  


https://en.wikipedia.org/wiki/Coercivity  

https://en.wikipedia.org/wiki/Coercivity  


bc