Physics help! - Electromagnetism

[AstroBenny]

I need help with this question:

"Describe a method for investigating magnetic field lines using iron filings"

Any ideas? Thanks.

[don_svetlio]

put a magnet on a a table. Spread them around.

[AlwaysFSX]

Toss magnet in pile of iron filings.

[TheRandomness]

A magnet will create patterns in iron filings.

[roastduck]

Place magnet on table

cover magnet with paper

sprinkle iron filings to taste

???

profit

[AstroBenny]

Thanks- and one more!

What is a uniform field and how can it be obtained?

[blackadder]

Either make a wet magnet or dry magnet,look them up.

[blackadder]

Thanks- and one more!

What is a uniform field and how can it be obtained?

its a field that has the same energy distribution all around. If they are the only thing in the universe they will be perfectly uniform, anything else close by will cause it to deform slightly.

[soup]

A basic primer but covers (to a headline level) the salient points.

http://www.bbc.co.uk/education/guides/zxxbkqt/revision/2

 

Note this is the second page which includes uniform fields.