2.                                                                  
Electro Magnets

3. Magnetic field
When electricity passes through a wire it creates a small magnetic field.
If a compass is held next to a circuit, the needle will move when the circuit is turned on and off.

4. Magnetic field shape
Depending on the way the current is flowing, the magnetic field flows around the wire as shown.
Magnetic field
Wire

5. Magnetic fields in a wire
In a wire that is in any shape, the magnetic fields do not pass in the same direction.
It does not create any significant magnetic force.

6. Electro magnet
When a wire is coiled around a piece of metal the magnetic fields pass in the same direction.
This makes the metal magnetic.
                                                                            

7. Magnetic particles
The metal becomes magnetic because the particles in the metal that are usually pointing in random directions are moved by the magnetic field produced by the wire.

8. On and off
The benefits of an electromagnet are that it can be turned on and off.
When it is turned off, the magnetic force takes time to disappear.

9. How to make it stronger
Current
Turns of wire
Material of the core

10. Uses