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jaidev
jaidev asks:
Q:

Is there a relationship between the size and strength of a magnet?

where can i find information on this topic i have been searching all day ? His science project is on magnets about the relationship between the size and strengths of a magnetic and i don't know how to help him with the information
In Topics: Science fair
> 60 days ago

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Expert

greenprof2
Jan 18, 2011
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What the Expert Says:

Magnet size does affect strength. Other factors that affect magnet strength are:
-the 'grade' of the material the magnet is made of, and
-whether you have iron or steel behind the magnet, and how thick it is.

Magnet strength is measured in Gauss, or in Tesla (1 Tesla = 10,000 gauss) using an electronic gaussmeter, an expensive instrument. There are 2 other ways you can measure magnet stregnth easiliy and cheaply:
-A chain of paperclips of bottlecaps. The more paperclips hang in a single chain below the magnet, the stronger it is.
-lifting force on steel or iron. You'll need steel weights-like steel washers. Using the same shape of weights is important, because the magnet needs to be fully touching the steel--curved surfaces, etc. will throw off your measurement. The more weight it can lift, the stronger the magnet.

You'll also notice how the magnetic field decreases with the square of the distance from the magnet--so at 2 inches away, the field will be 4 times weaker than at 1 inch away.
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