An Apparatus for Investigating the Magnetic Field due to a Wire
Sytil Murphy and Dean Zollman
A new apparatus has been developed for exploring the magnetic field due to a wire. The apparatus is made of clear Plexiglas with a wire running through a triangular channel. The wire is connected to a battery and a switch. A compass can be used to detect the strength and direction of the magnetic field due to the wire and, because the apparatus is clear, compasses placed above and below the wire can be viewed simultaneously. When the switch is tapped, a compass placed above or below the wire may deflect depending on the orientation of the apparatus relative to an external magnetic field. Using the compass as a detector, the direction and strength of the magnetic field due to the wire can be investigated. In addition, the apparatus can be used to investigate the resonance frequency of a compass in a magnetic field.
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