Elf

any ferromagnetic material will exhibit such pheonomenal, and not only iron will do that, but also nickel and cobalt. the can is not made entirely from aluminium, but aluminium alloy, which probably includes nickel for higher durability

Elf

引用:

原帖由 tango1997 於 14-4-2011 21:38 發表


師兄可能誤會左

小弟講個一個"橋"住鉄棒通電,另鉄棒自身磁化,好似教育電視科學科造個一個實驗咁樣

師兄你講個一種小弟都知道,就好似在大工字鉄鑽窿個一種流動鑽床,底 ...

there are naturally occurring magnetic minerals, like iron ii/iii (fe2o3/fe3o4)
as well as some transition metal tend to do okay
but if you need a strong magnet you have to put them through magnetisation.

oh chemistry... i've forgotten it all