Physics Dept. Demonstration Manual

DEM80 - Jumping Cow Magnet

Status: Available

to use a solenoid to launch a magnet into the air.


- Anatek Power Supply set to 15V D.C.
- Variac set to 70 V A.C.
- lab stand and clamp
- solenoid
- cow magnet
- DEM80 pulse generator and full bridge rectifier
- leads
- small foam pad taped down under solenoid


Warning: Ensure that no one looks down the solenoid once the circuit is powered up, in case the solenoid fires unexpectedly. The power should be turned off when done.

With the equipment connected as shown, press the button. If the magnet is pointed the right way, it will shoot into the air. A short pulse is sent into the solenoid such that the magnet is pulled into the solenoid to the half-way position, at which point the solenoid turns off.