7 Magnetism.notebook

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Magnets

May 17­9:26 AM

The magnetism of an item has to do with its Domains

Tiny atom sized poles inside an object (actually its electron spin)

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Magnetic polarity

Magnetic fields

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Field Strength at a distance

N S

g≈ 1d2 ε≈ 1

d2B≈ 1

d3

Magnetic poles

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Current and magnetismthe movement of charged particles will cause the formation of a magnetic field

Dec 3­8:46 AM

Conventional Current assumes that current flows out of the positive terminal (positive particles). It is wrong!Electron Flow is what actually happens and electrons flow out of the negative terminal.

To avoid confusion pay attention to what is moving; electrons or positive particles (conventional current)

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Left hand rule for conductors

Reach out to grab wire with Left HandPoint thumb in direction of the negative particle's motionFingers wrap with the magnetics field

Jan 13­9:21 AM

p+

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CoilsThe magnetic field of a wire can be increased by upping the current or placing many wires side by side

May 17­9:30 AM

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Left hand rule for CoilsFingers follow the negative particles inFingers wrap with the coilThumb points in direction of the field

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