1. oneone GTE-11 Objective: To diagram magnetic lines of force in order to identify the magnetic fields of single magnets. Energy Note: How can magnetic fields be seen?? Drill: 1. Get a new lab from the SET. 2. Complete the Drill in Activity 1.

2. oneone GTE-11 What do you think is meant by the term “magnetic field”? The area around a magnetized object affected by its magnetism.

3. oneone GTE-11 Activity 2: Diagramming Magnetic Fields DEMO S N

4. oneone GTE-11 S N Why do you think this pattern occurs? The iron filings line up according to the forces within the magnetic field.

5. oneone GTE-11 MAGNETIC FIELDS Any magnet, no matter what its shape, has two ends called poles. A pole is the area of a magnet where the magnetic effect is strongest. One pole of a magnet points towards magnetic north of the earth and is labeled north. The other pole is labeled south.

6. oneone GTE-11 Although magnetic forces are strongest at the poles of a magnet, they are not limited to the poles alone. Magnetic forces are felt around the rest of the magnet as well. The region over which the magnetic forces can act is called a magnetic field. A magnetic field can be drawn using magnetic lines of force extending from one pole of a magnet to the other.

7. oneone GTE-11 The following guidelines should be applied when making magnetic field diagrams of magnets: Representative arrows must leave the north pole of the magnet. Representative arrows must enter the south pole of the magnet. Representative arrows are more concentrated at the poles of a magnet.

8. oneone GTE-11 Proper Force Diagram S N

9. oneone GTE-11 You have diagrammed the magnetic fields for bar magnets. Now, let’s consider the magnetic fields for other shaped magnets. In your Log Book draw a horseshoe magnet. Draw magnetic lines of force to predict how the magnetic field will look.

10. oneone GTE-11 RESULTS N S

11. oneone GTE-11 HOMEWORK

12. oneone GTE-11 Objective: To diagram magnetic lines of force in order to identify the magnetic fields of pairs of magnets. Energy Note: How can magnetic fields be seen?? Drill: 1. Take out your Activity Sheet from Friday. 2. Get a new ditto from the SET. 3. Make your first prediction only. 4. Take out your Career Day form.

13. oneone GTE-11 Opposite Poles NS

14. oneone GTE-11 North and North NN

15. oneone GTE-11 South and South SS

16. oneone GTE-11 Two Horseshoe Magnets – Like Poles S N S N

17. oneone GTE-11 Analysis: Explain how the magnetic field of each bar magnet is altered when the north pole of one magnet is brought near the south pole of the other magnet. Justify your response using evidence from the investigation. When the north pole of one magnet is brought near the south pole of the other magnet, the magnetic fields __________ each other. The iron pieces formed