SPI 0807:12.2Electromagnetism

Bell Work

Jan 13, 2015

InstructionsA) The electromagnet shown below consists of 3 basic components.

(1) A solenoid, (2) An iron core, & (3) A batteryB) Draw this diagram on your own paper, and label these 3 items.

Instructions1) 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.

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

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 Field

Magnetic Fields

Notes SPI 0807:12.3Magnetic Fields Science

magnetic field lines originate at the polesYou can see them by using fine iron filings.

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 ConceptTitle: Magnetic Poles

Notes Science

South Pole

SPI 0807:12.3Magnetic Fields

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

Notes ScienceSPI 0807:12.3Magnetic Fields

Horseshoe Magnet

Bar magnet

Donut magnet

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)

Notes ScienceSPI 0807:12.3Magnetic Fields

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 Our planet has a powerful magnetic field

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 (Artic Circle)

Magnetic North

Geographic South

Notes Science

Magnetic SouthGeographic North

Notes SPI 0807:12.3Magnetic Fields Science

Magnetic South Pole

Magnetic North Pole

Notes SPI 0807:12.3Magnetic Fields ScienceEarth's magnetic field is called the magnetosphere.

It protects us from harmful solar radiation

Notes SPI 0807:12.3Magnetic Fields Science

View this video: Title: "Dance of the Spirits-Northern LightsLink: Northern Lights 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