Electromagnets (505-2) This kit is designed for elementary through high school students to learn the principles and applications of electromagnets. Includes two coils on plastic spools a U shape iron core, a straight iron core, two magnetic needles with stands, and a pair of wires. Students can build a bar and a U shape electromagnets with a 6V battery or DC power supply, and determine the magnitude and polarity of electromagnetic forces. Comes in a 5 x 5 x 1.5" plastic case. Weights 7 oz. Qty :