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How to calculate how much force is produced by a small 3cm-3cm-3.5cm rectangular magnet?
- Nicholas Rice (age 16)
Barstow High School, CA, USA
There are ways to calculate the force from a magnet, but you have
to know more than just how big the magnet is. Most importantly, you
need to know what it's made of - some magnetic materials create a
stronger magnetic field than others. You also need to know what the
other object is that feels the magnetic force. Another magnet would
probably feel a stronger force than a sheet of steel, and a piece of
plastic or aluminum would feel almost no force at all. The size and
shape of the object also strongly affect the magnetic force on it. The
easiest way to figure this out is to try using the magnet to lift
various sized objects (of the same material). The weight (in pounds) of
the heaviest object that you can lift using the magnet is the force
that the magnet produces on it.
(republished on 07/13/06)
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