PURPOSE: To illustrate the force which can be exerted by a small electromagnet.

DESCRIPTION: An electromagnet operated by a single flashlight battery holds up an iron brick as in the photograph. Flip the switch off to allow brick to fall, awakening your students.

SUGGESTIONS:

REFERENCES: (PIRA unknown.)

EQUIPMENT: Electromagnet with D-cell on stand with iron brick.

SETUP TIME: 5 min.