Purpose:Demonstrate that current-carrying coils produce magnetic fields and interact like bar magnets
Description:Two coils are aligned with their currents moving
around in the same direction, so their magnet fields will be
North-to-South. They will attract each other when the current is started
by pushing the switch (click here for
video). Reversing the wires on the top can put any
combination of magnetic poles adjacent, getting either attraction or
repulsion (click here for video). A small bar
magnet, included with the demonstration, can be used to see the forces
between one of the coils and the magnet, again using any combination of
magnetic poles (click here for video).