SPI 0807:12.2

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SPI 080712.2 Electromagnetism
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Bell Work
Jan 13, 2015
Instructions A) The electromagnet shown below
consists of 3 basic components. (1) A solenoid,
(2) An iron core, (3) A battery B) Draw this
diagram on your own paper, and label these 3
items.
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SPI 080712.3 Magnetic Fields
Notes
Science
Tennessee SPI Objective Distinguish among the
Earths magnetic field and the fields that
surround a (permanent) magnet and an
electromagnet.
Check for Understanding Create a chart to
distinguish among the earths magnetic field and
the fields that surround a (permanent) magnet and
an electromagnet.
Essential Question(s) What is a magnetic field?
What are the similarities and differences between
the Earths magnetic field and the fields from
permanent magnets electromagnets?
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SPI 080712.3 Magnetic Fields
Notes
Science
Magnetic Fields

• An invisible magnetic field exists around all
  magnets.

See Holt Online Ch. 16 Sect 1 Visual Concept,
Title Magnetic Field
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SPI 080712.3 Magnetic Fields
Notes
Science
Magnetic Fields

• magnetic field lines originate at the poles
• You can see them by using fine iron filings.

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SPI 080712.3 Magnetic Fields
Notes
Science

• Magnetic Poles
• are areas on a magnet that have opposite magnetic
  qualities.
• North and South
• One area is called the north pole.
• The opposite area is called the south pole.
• See Holt Online Ch. 16 Sect 1 Visual Concept
• Title Magnetic Poles

South Pole
North Pole
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SPI 080712.3 Magnetic Fields
Notes
Science

• North and South Poles
• All magnets have these poles regardless of the
  shape of the magnet

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SPI 080712.3 Magnetic Fields
Notes
Science

• Magnetic Forces
• magnets exert a magnetic force on other magnets
  due to spinning electric charges in the magnets.
• Opposites attract (North South pull towards
  each other)
• Like repels (North North or South South
  push away)

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Earth is a Giant Magnet
SPI 080712.3 Magnetic Fields
Notes
Science

• Our planet has a powerful magnetic field

See Holt Online Ch. 16 Sect 1 Visual
Concept Title "Earth's Magnetic Field"
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SPI 080712.3 Magnetic Fields
Notes
Science

• Now for the confusing part
• Earth's north magnetic pole is at the southern
  end (Antarctica)
• Earth's south magnetic pole is at the northern
  end (Artic Circle)

Geographic North
Magnetic North
Magnetic South
Geographic South
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SPI 080712.3 Magnetic Fields
Notes
Science
Magnetic South Pole
Magnetic North Pole
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SPI 080712.3 Magnetic Fields
Notes
Science
Earth's magnetic field is called the
magnetosphere. It protects us from harmful solar
radiation
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We can see the solar wind hitting Earth's
magnetosphere. In the northern hemisphere this is
called the Aurora Borealis. In the southern
hemisphere this is called the Aurora Australis
SPI 080712.3 Magnetic Fields
Notes
Science
View this video Title "Dance of the
Spirits-Northern Lights Link Northern Lights
Video Clip