Study the magnetic field of a current-carrying coil and discover how an iron core affects it. This device is used for many demonstrations involving electric magnets or solenoids. A plastic spool is wrapped with three layers of 20-gauge magnet wire. A 1.8cm diameter removable steel core is located inside the solenoid. Insulated binding posts are found at each end for application of an electric current. Included is a 3/4" by 6" steel core. An instruction sheet is provided. Measures 8" length by 4" width by 4" height.
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