Do magnets attract all metals, and is the speed of light in a water

[x86]

Homework Statement

Do magnets attract all metals, and is the speed of light in a water constant?

Homework Equations

None that I know of

The Attempt at a Solution

I would assume that magnets attract almost all metals because they have an electron sea in them and they would be attracted to the magnet.

But what about the speed of light in water? My physics teacher said that the speed of light in water depends on the medium it comes from. But I read that its always a constant value (3 *10^8m/s / 1.33)

Is it true that the speed of light in water would be different if the light came from a vacuum, compared to if the light came from say a diamond?

 

[SteamKing]

1. check out the section on magnetic materials: http://en.wikipedia.org/wiki/Magnet

2. speed of light: http://en.wikipedia.org/wiki/Speed_of_light

 

[x86]

1. check out the section on magnetic materials: http://en.wikipedia.org/wiki/Magnet

2. speed of light: http://en.wikipedia.org/wiki/Speed_of_light

After reading those articles, it is my understanding that not all metals are attracted by magnets (like copper is repelled) and that the speed of light in water will always be constant, no matter what medium it comes from.

Can you confirm that this is correct?

 

[rude man]

After reading those articles, it is my understanding that not all metals are attracted by magnets (like copper is repelled) and that the speed of light in water will always be constant, no matter what medium it comes from.

Can you confirm that this is correct?

Yes to both.

 

[x86]

Yes to both.

Thank you for clearing up my confusion

 

[CWatters]

http://askville.amazon.com/metals-magnetic/AnswerViewer.do?requestId=28681534

"There are 86 metals 81 of these are not magnetic"

 

[rude man]

http://askville.amazon.com/metals-magnetic/AnswerViewer.do?requestId=28681534

"There are 86 metals 81 of these are not magnetic"

Actually, practically all materials are diamagnetic. For ferromagnetic and paramagnetic materials the diamagnetic property is totally overshadowed, however. Diamagnetism is always a weak phenomenon compared to ferro- or paramagnetism.

http://en.wikipedia.org/wiki/Diamagnetism