Hematite is a magnetic metal

[quasar987]

Hematite is a magnetic metal and a small amount of it can produce fields up to 600 gauss (http://cgi.ebay.ca/MENS-JEWELRY-MAG...029171967QQcategoryZ10297QQrdZ1QQcmdZViewItem). How many gauss are necessary to damage things such as a computer screen, TV screen... What are other items that are suceptible to be damaged by magnetic fields? What about digital atches?

 

[Astronuc]

Well my son has managed to hose our TV screen with some small magnetic wands - but I don't know how the field strength.

We had the screen degaussed.

Possibly credit cards or anything that has magnetically stored information could be harmed by a strong magnetic field.