Tennessee SPI Objective: Check for Understanding Essential Question(s) Instructions 1) First click on "View" from the top-menu bar. 2) Then click on "Slide Show" from the drop-down menu. 3) Then use the right-arrow button on your keyboard to advance through this presentation. SPI 0807:12.3 Magnetic Fields Notes Science Tennessee SPI Objective: Distinguish among the Earth’s magnetic field and the fields that surround a (permanent) magnet and an electromagnet. Check for Understanding Create a chart to distinguish among the earth’s 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 Earth’s magnetic field and the fields from permanent magnets & electromagnets?
See Holt Online: Ch. 16: Sect 1 Visual Concept, SPI 0807:12.3 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
Notes Science SPI 0807:12.3 Magnetic Fields Magnetic Fields You can see the magnetic field lines of a magnet by using fine iron filings.
Notes Science SPI 0807:12.3 Magnetic Fields Earth is a Giant Magnet Our planet has a powerful magnetic field See Holt Online: Ch. 16: Sect 1 Visual Concept Title: "Earth's Magnetic Field"
Notes Science SPI 0807:12.3 Magnetic Fields 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 Geographic South Geographic North Magnetic North Magnetic South Geographic South
Notes Science SPI 0807:12.3 Magnetic Fields Magnetic South Pole Magnetic North Pole
Notes Science SPI 0807:12.3 Magnetic Fields Earth's magnetic field is called the magnetosphere. It protects us from harmful solar radiation Science
Notes Science SPI 0807:12.3 Magnetic Fields 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 0807:12.3 Magnetic Fields Notes Science View this video: Title: "Dance of the Spirits-Northern Lights Link: Northern Ligths Video Clip
See Holt Online Ch. 16: Sect 1 Visual Concept SPI 0807:12.3 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
Notes Science SPI 0807:12.3 Magnetic Fields Magnetic Forces magnets each 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)