Designed for elementary through high school students to learn the principles and applications of electromagnets. Includes 2 coils on plastic spools, a U-shaped iron core, a straight iron core, 2 magnetic compasses, and a pair of wires. Students can build a bar and a U-shaped electromagnet and determine the magnitude and polarity of electromagnetic forces. Includes plastic storage case and instructions. Requires one 6-V battery (not included) or DC power supply (not included).