A natural Magnet, magnetite or Lodestone Fe3O4.
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Transcript of A natural Magnet, magnetite or Lodestone Fe3O4.
A natural Magnet, magnetite or Lodestone Fe3O4
Chinese South Pointer
Circa 1100 A.D.
Earth Globe with strong magnet inside. The staples align with the field.
Gilbert made a sphere of magnetite and used small iron rods to explore its magnetic force.
He discovered that the reason magnetic compass needles pointed north was that the earth was a magnet.
Here the equator is vertical.
Text
Magnetic Sandon
Radar Magnetsmade of AlNiCo
Black magnetite sand follows magnetic field lines.
Field lines Michael Farady
Magnetic Bacteria navigate using the Earth’s magnetic field.
Magnetotacticum AquaspirillumBlack crystals are magnetite.
The magnetic field of
the earth deflects
ionic particles
in the solar wind.
Earth, north and south aurora
Jupiter Aurora
Saturn Aurora
Solar Magnetic field lines.Plasma follows the field lines.
The magnetic field lines that come up out of the center magnet curve around and down on its
sides exerting an upward force on the adjacent magnets.
Iceland, Ingolsfjall moberg, a volcano born inside a glacier.
Iceland, Ingolsfjall moberg, Top 1/2 current magnetic fieldBottom half reversed.
Antarctic lava flowNear Mt. Morning.
Geologist marks magnetic north on a bedrock sample
Theoretical model of a possible flip of the earth’s field.
Pieces of magnetic cassette tape record magnetic fields
Magnetic stripes in ocean floor lavas.
USGS Menlo Park magnet laboratory.
Magnetic stripes on Mars
What is magnetism?
Electric charge at rest Electrostatics
Electric charge: Constant speed
Magnetism
Electric charge:Accelerating
Electromagnetic Radiation
An Electromagnet.
All magnetism comes from
moving electric charges or changing
electric fields.
Every iron atom is a magnet. Atoms align in domains. In a nonmagnetic piece of irons the direction of domain magnetization is random.
See Magnetic domains
Grapes are Diamagnetic, repelled by both magnetic poles
Oxygen in the air is paramagnetic, attracted to a magnet.
The flame is low in oxygen and experiences a bouyant force away from the magnet.
QuickTime™ and aYUV420 codec decompressor
are needed to see this picture.
A ball of water (with green dye added) is diamagneticaly suspended in a magnet.
QuickTime™ and aYUV420 codec decompressor
are needed to see this picture.
A magnetically levitated frog.
A human in a magnetic resonance imager.
Whole Body MRI
Graphite levitated over a strong magnetic track.
A magnet guided down
a track.
A NIB magnet falling
between two aluminum plates falls
slowly due to electromagnetic induction.
Drop ZoneCars are stopped by magnet induced eddy currents.
Electric Guitar