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Magnets In The 21st Century

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Hannah Donlin

on 29 April 2010

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Transcript of Magnets In The 21st Century

Magnets In The 21st Century Medicine Astronomy Electronics Navigation Toys Magnetic Resonance Imaging (MRI) An MRI uses a primary magnet,
gradient magnets, and a coil.
The coil emits a radio frequency
that makes the MRI possible. The
gradient magnets make it possible
for the MRI to focus on one part
of the body. Developing a magnetic
field of adequate strength to
create MRI images. Magnetic Therapy Exposing certain parts of the body
to magnetostatic fields produced by
permanent magnets has beneficial
health effects.The benefits can be
faster wound healing, and increased
energy and vitality.
Imagine a magnet so powerful that
any starship coming within a million
miles of it would be pulled into it.
Such magnets exist in our own galaxy.
They are a unique kind of neutron
star called magnetars.

Magnetars Televisions have magnets inside of them that make them work. These cathode ray tubes have an electron gun in the neck of the tube that shoots a stream of electrons toward the screen. Normally these electrons travel in a straight line and strike the screen at a central spot. Television
Computer storage disks are coated
with an iron material that stores
tiny magnetic fields in a pattern,
and that is how we store data on
the computer disks.
Storage Disk A compass needle is also a magnet,
with north and south poles. One pole
of the needle is north-seeking and
is marked "N", that is, it always
points to the Earth's magnetic north
pole. Similarly, the other pole of
the compass needle, marked "S", is
south-seeking and always points to
the Earth's south magnetic pole.

Compass First introduced in 1955, Wooly
Willy is a classic magnetic toy.
Start with a blank face and use
the magnetic wand to move the
metal shavings around to create
new hairstyles for Willy. Wooly Willy Magnetix magnetic sticks connect
to magnetic balls to create
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