Diamagnetism

Diamagnetism is also a magnetic property that is only manifest when the object is situated in a magnet field.  It differs, however, from paramagnetism in that a diamagnetic material is not attracted but repelled by the field. Diamagnetic materials have a magnetic permeability of less than unity. The diamagnetic effect is normally very weak and most materials exhibit diamagnetism. However, if the substance has other magnetic properties the diamagnetic properties are swamped and not normally discernable. Common diamagnetic materials are carbon (diamond and graphite) copper, silver and lead. As a result of diamagnetisn carbon can be levitated over a permanent magnet with no applied external energy except on placement