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Magnetic Field Lines

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Magnetic Field Lines
Date: 13.10.2012

Student Exploration: Magnetism

Vocabulary: attract, bar magnet, ferromagnetic, magnetize, North Pole, repel, South Pole

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. What happens when you place two magnets close together? It depends on the sides when the two North Pole sides are meant then they get pulled together. And if it should be the opposite way then they will move each other away.

2. What objects do magnets stick to? Make a list iron and steel, zinc, gold nickel, copper, and brass.

3. What do these objects have in common? They are all made of metal and are so magnetized to the objects shown above this answer.

Gizmo Warm-up: What is attracted to magnets?

A bar magnet is a simple rectangular magnet. If you hang a bar magnet by a string, the north pole (N) of the magnet will tend to point north while the south pole (S) of the magnet points south.

1. Look at the materials at the bottom of the Gizmo™. Which ones do you think will stick to a bar magnet?

Nickel, and Iron.

2. Ferromagnetic materials are strongly attracted to magnets. Drag a bar magnet and the piece of nickel onto the scribbled line. Press Play ([pic]).

A. Is nickel ferromagnetic? Yes

B. How do you know? The atoms in ferromagnetic materials like to align their magnetic dipoles with the external field.

3. Test copper, wood, glass, and iron. Which ones are ferromagnetic? Only the iron is ferromagnetic

|Activity A: |Get the Gizmo ready: |[pic] |
| |Check that the Magnetic forces tab is selected. | |
|Attract or repel? |Click Reset ([pic]). | |

Question: How do magnets interact?

1. Observe: Drag two

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