The topic of electromagentism was covered in three days between the third and fourth week of the physics block with the grade eight students of East Bay Waldorf. We began by playing with permanent magnets (magnets that have been commercially produced or are naturally-occuring, and hold their magnetic field). We experienced the force of a magnetic field.
We then built an electromagnet using wire, a 9 volt battery, and an iron nail. Looping the wire created a solenoid, which multiplied the magnetic force present in the wire. The addition of an iron core, such as a nail, further amplified the magnetic force.