A natural Magnet, magnetite or Lodestone Fe3O4.

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Presentation transcript:

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 Sand on Radar Magnets made of AlNiCo

Black magnetite sand follows magnetic field lines.

Field lines Michael Farady

Magnetic Bacteria navigate using the Earth’s magnetic field.

Magnetotacticum Aquaspirillum Black 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 field Bottom half reversed.

Antarctic lava flow Near 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.

A ball of water (with green dye added) is diamagneticaly suspended in a magnet.

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 Zone Cars are stopped by magnet induced eddy currents.

Electric Guitar