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Comments (8)
johnlittlephysics said
at 3:08 am on Jul 22, 2014
Magnetic materials:
Metals: iron, cobalt, nickel
Alloys of these metals: steel, alnico
http://en.m.wikipedia.org/wiki/Category:Ferromagnetic_materials
johnlittlephysics said
at 3:10 am on Jul 22, 2014
Non-magnetic materials:
Metals: copper, aluminum; Alloy: brass (of copper & zinc)
Non-metals: wood, paper, glass
johnlittlephysics said
at 4:11 pm on Jul 23, 2014
Kah Leng: I would like to ask if we are required to know any differences between ferromagnetic materials and magnetic materials. I know that ferromagnetic materials are magnetic materials with iron in them, but do they have any different properties as compared to magnetic materials(that we need to know)?
johnlittlephysics said
at 4:11 pm on Jul 23, 2014
When we refer to magnetic materials, we mean ferromagnetic materials. I have listed common ones above.
At our level , the term magnetic materials would be sufficient.
johnlittlephysics said
at 4:14 pm on Jul 23, 2014
Xin Qi: just to clarify, is it when magnetic materials or otherwise known as ferromagnetic materials are attracted to magnets, magnetic induction took place and that they have become magnets caused by induction?
johnlittlephysics said
at 4:18 pm on Jul 23, 2014
Yes, when a magnetic material is in contact with (or very near to) a strong magnet (permanent, or electromagnet), it becomes a temporary magnet by the process of magnetic induction. It becomes an induced magnet (a weak magnet).
johnlittlephysics said
at 3:21 pm on Aug 10, 2014
Yu Qing: can I ask what's the difference between magnetic shielding and magnetic screening? And is only ferromagnetic materials used for it?
johnlittlephysics said
at 3:24 pm on Aug 10, 2014
1. The two terms mean the same thing.
2. Yes, ferromagnetic (normally we refer as magnetic) material is used. It should be the soft type - soft magnetic material, esp. soft iron. This allows it to be magnetized easily & quickly by induction.
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