ELECTROMAGNETISM Basics in Magnetism Electromagnetism Force on a
ELECTROMAGNETISM Basics in Magnetism Electromagnetism Force on a Current-Carrying Wire EM Induction Transformer Generators Electric Motors
The ABCs of Magnets v How was magnetism discovered? v What are the two poles of a magnet? v What materials do magnets attract? v How do magnets attract objects? v Is the earth a magnet? v What was first invented out of magnets?
How was magnetism discovered? Magnetite or lodestone
What are the two poles of a magnet? Magnetic Domains North and South Pole Like poles repel; opposite poles attract.
What materials do magnets attract? nickel iron cobalt
“Magneto attracts Ironman. ”
How do magnets attract object? Magnetic Field Region of space around a magnet that applies an attractive or repulsive force Direction is from North to South Magnetic Field Lines
Drawing magnetic field lines 3 4 2 1 Arrows are from North to South
Field lines of attraction Field lines of repulsion
Is the Earth a magnet? e l o P h t ou S c i t e Magn e l o P h t r o N c i t e Magn Auroras
What was first invented out of magnets? Compass 指南针
Making Magnets: Which makes better magnets? iron Magnetizes quickly Temporary magnets (electromagnets) steel Keeps magnetism longer Permanent magnets
Some uses of permanent magnets tools Fridge door locks
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