We have built a simple electromagnet which contains a 2.5cm thick iron bar 30cm long, and with two layers of 1mm thick insulated copper wire wrapped around.
(We; have built; a simple electromagnet which contains a 2.5cm thick iron bar 30cm long) (a simple electromagnet; contains long; a 2.5cm thick iron bar) (two layers of 1mm thick insulated copper wire; wrapped; around)
We a simple electromagnet two layers of 1mm thick insulated copper wire
have built contains long wrapped
a simple electromagnet which contains a 2.5cm thick iron bar 30cm long
a 2.5cm thick iron bar
around