Classic demonstration of how a current loop generates a magnetic field. Two coils of insulated wire, with 5 and 10 turns respectively, are wound around a 6" diameter plastic ring. The ring is mounted on a plastic base with 3 binding posts that allow connection to five, ten or fifteen turns of wire. A magnetic compass (included) can be placed on the base to observe and measure deflection of the compass. An activity guide is included. Power source and connecting wires not included. Shipping weight: 1 Lb. Package Dimensions: 10" x 7" x 3".