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14_16Magnetism

Page history last edited by johnlittlephysics 9 years, 8 months ago

16 Magnetism



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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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