exhibit demonstrates how a solenoid works and presents two familiar
applications of this device. A large coil and variable power supply
are the main components of this exhibit. The coil can be plugged
in with the current running in either direction. A large steel rod
can be inserted into the coil. Hanging from the exhibit is a magnet
and a compass to allow further exploration of the magnetic field
surrounding the solenoid. The familiar devices on the table are
a doorbell and a pinball machine flipper, both button-actuated.