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Q & A: What are ferrous materials?

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Most recent answer: 03/25/2009
Q:
what are ferrous materials and non ferrous materials what is the diff aswellwhat are the magnetic properties of iron ans steelwhat are three uses of permanent magnets and electromagnets?
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- helen (age 15)
A:
The word "ferrous" usually refers to materials that have a lot of iron in them. It's common for these materials to be strongly magnetic, but not all of them are. Different types of iron and steel are more or less magnetic. High-chromium stainless steel is nearly non-magnetic, while pure iron tends to form magnets easily. Iron with impurities usually stays magnetic better than pure iron, however. As for "non-ferrous" materials, it’s pretty hard to make any generalizations. That’s a little like trying to describe non-elephants- the category is too broad. In case you’re wondering, there are plenty of non-ferrous magnetic materials. In fact, some of the strongest permanent magnets you can get are based on "rare-earth" elements, such as neodymium, rather than on iron.

Ok, here’s some uses of magnets:

If you want to tack a note on your refrigerator door without getting it gummy, you may use a permanent magnet to hold it up.

The electricity you get from a wall socket was generated by moving wires near permanent magnets (or vice-versa) at the generating plant.

A compass uses a small permanent magnet for its needle.

Electric motors use magnetic forces from electromagnets, and in some motors also permanent magnets.

Recycling facilities use electromagnets to separate steel cans out from other material.

If you ever need to have a magnetic resonance image taken for medical reasons, some or all of you will be shoved into a big superconducting electromagnet.

We could go on and on- magnetism is used all over the place.

Mike
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(published on 10/22/2007)

Follow-Up #1: Mike's age

Q:
Helen is 15 . . . how old are you, Mike?
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- Anonymous
A:
He's a graybeard, like me.   Heh heh.

LeeH
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(published on 03/25/2009)

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