Why do powerful magnets can only absorb iron with copper?
Powerful magnets have forces on all kinds of metal, but powerful magnets are paramagnetic size can be slight, reverse magnet magnet will be powerful magnet mild rejection, and ferromagnetic feel attracted to strong magnet.
Powerful magnets containing nickel stainless steel can be magnets (
Attract, do not contain nickel stainless steel (
Usually contains chromium)
This iron reflect weak, difficult to detect, the latter because powerful magnets containing chromium and high hardness.
The former is called stainless iron, powerful magnets to aluminum and copper with a long thin wire suspension, and still not swing, transverse slowly close to aluminium or copper with magnet, shenzhen star can create magnetic industry found that they will be mild attraction or repulsion, so they are paramagnetic respectively and inverse magnets.