im doin diploma in engineering and need to know briefly but in technical terms why its used if any one can answer please do!!!
2007-02-04 22:55:27 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Iron molecules are like tiny magnets with a N and S pole.In ordinary conditions these point in different directions,cancelling each other out so it is not a magnet.In the process of magnetisation(various methods) these 'tiny magnets'line up like soldiers on parade.Every N and S points in the same direction.This is why when you cut a magnet in half you get two magnets.
/- /-/-/-/ ............. - - - - - - -
-/-/-/-/-/ becomes - - - - - - -
I've no back slashes on here but you get the picture..I hope.
2007-02-04 23:53:55 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Iron containing materials, called ferromagnetic or ferromagnets, are highly magnetic by nature, relative to most materials. They are composed of a large number of very small magnetic units working together called domains. Domains are not always aligned, and they often act against each other to reduce the strength of the net magnetic field.
If one puts the ferromagnetic material into an externally applied magnetic field, the domains tend to line up, so that the sum of the fields from the ferromagnet and the resulting magnetic field is higher in magnitude than the applied magnetic field alone.
2007-02-05 09:45:27 · answer #2 · answered by oleg_arch 2 · 0⤊ 1⤋
most magnets today are made with compounds in the form of ceramics ferous material is not the only material used. but the process now used to make powerful magnets is through inducing a coil around the object with a massive discharge current, a way of doing this is by storing up electric energy in capacitors then discharging them through the coil the dines energy of the magnet is related to the ampere turns on the energising coil
2007-02-05 07:14:47 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Mainly cost and historical use (cf lodestone).
Other elements with magnetic ability can be prohibitively expensive. If steel is used, it will become permanent magnet, but pure iron can lose its magnetism, if not used in an electromagnetic field.
2007-02-06 03:33:09 · answer #4 · answered by Robert S 2 · 0⤊ 1⤋
Because its a ferrous metal, all non ferrous metals i.e aluminium are non metallic so would not work as they are not magnetic.
2007-02-05 07:05:48 · answer #5 · answered by andy b 3 · 0⤊ 1⤋
because it has magnetic properties.
2007-02-05 06:58:49 · answer #6 · answered by rose_merrick 7 · 0⤊ 1⤋