notes science essential question(s) what is a magnetic field? what are the similarities and...
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Notes Science
Essential Question(s)What is a magnetic field? What are the similaritiesand differences between the Earth’s magnetic field andthe fields from permanent magnets & electromagnets?
Tennessee SPI Objective:Distinguish among the Earth’s magnetic field and the fields that surround a (permanent) magnet and an electromagnet.
Check for UnderstandingCreate a chart to distinguish among the earth’smagnetic field and the fields that surround a(permanent) magnet and an electromagnet.
SPI 0807:12.3 Magnetic Fields
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Magnetic Fields
Notes SPI 0807:12.3Magnetic Fields Science
An invisible magnetic field exists around all magnets.
See Holt Online: Ch. 16: Sect 1 Visual Concept Title: Magnetic Fields
N S
Magnetic Fields
Notes SPI 0807:12.3Magnetic Fields Science
You can see the magnetic field lines by using fine iron filings.
Note: - the field lines are concentrated at the ends (called poles)
South Pole
F.Y.I: Why Are Some Substances Magnetic?All atoms have magnetic fields with north and south poles
Notes ScienceSPI 0807:12.2
Electromagnets
If the north and south poles in a domain line up, this makes the object magnetic. If they don’t line up, the object is not magnetic.
Atoms in objects are found in areas called domains.
Magnetic Poles: North and Southareas on a magnet that have opposite magnetic qualities.One area is called the north pole. The opposite area is called the south pole. F.Y.I.-the field lines start at the north pole & end at the south pole
See Holt Online Ch. 16: Sect 1 Visual ConceptTitle: Magnetic Poles
Notes Science
South Pole
SPI 0807:12.3Magnetic Fields
North and South Poles All magnets have these poles regardless of their shape
Notes ScienceSPI 0807:12.3Magnetic Fields
Horseshoe Magnet
Bar magnet
Donut magnet
Also, if you cut a magnet in half, each half will still have these two poles (north and south)
Magnetic Forces magnets exert force on other magnets
Notes ScienceSPI 0807:12.3Magnetic Fields
“Opposites attract”
“Like repels”
(North & South pull towards each other)
(North & North or South & South push away)
See Holt Online: Ch. 16: Sect 1 Visual ConceptTitle: "Earth's Magnetic Field"
Notes SPI 0807:12.3Magnetic Fields Science
Earth is a Giant Magnet Earth has a powerful magnetic field called the geomagnetic field
This magnetic field comes from moving iron particles inside magma deep in the planet’s core
SPI 0807:12.3Magnetic Fields
Geographic North
Geographic South
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 (Arctic Circle)
Magnetic North
Geographic South
Notes Science
Magnetic SouthGeographic North
Notes SPI 0807:12.3Magnetic Fields ScienceAnother name for Earth's magnetic field is the magnetosphere.
The magnetosphere protects us from harmful solar radiation
Notes SPI 0807:12.3Magnetic Fields Science
View this video: Title: "Dance of the Spirits-Northern LightsLink: Northern Ligths Video Clip
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
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.3Magnetic Fields
Questions ScienceSPI 0807:12.3Magnetic Fields
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.3Magnetic Fields
Here is an example of a question you might see on a quiz or test.
Questions ScienceSPI 0807:12.3Magnetic Fields
Here is an example of a question you might see on a quiz or test.