1. Electromagnets

2. Magnetic Field Lines
We can represent the magnetic field around a wire or magnet using field lines.

3. Magnetic Field Lines
The arrows show the direction a compass needle would point at that point in the field.

4. Field around a magnet

5. Moving charges (currents)
Moving charges (electric currents) also produce a magnetic field
Conventional current – electrons flow in the opposite direction

6. Magnetic field around a straight conductor
Current OUT of page
Current IN to page
You can use the right hand screw rule to decide which direction the field goes

7. Electromagnets

8. Field around a solenoid

9. Field around a solenoid

10. Electromagnets

11. To make an electromagnet stronger
The 3 C’s
More Coils
More Current
Use an iron Core

12. The experiment
You will make a simple electromagnet by wrapping insulated wire around an iron nail and connecting it to a 1.5 V cell.
You will start with 100 turns and increase the number of turns by 50 at a time.
For each measurement you will be testing how many paperclips the electromagnet can pick up. The more paperclips, the stronger the magnet is.

13. To do list: Title Prediction Equipment List
Labelled diagram - use pencil!!!
Procedure (bullet-pointed)
Results Table (make room for repeats) - use pencil!!!