Basic Electrical Theory MAGNETISMElectromagnetismThe relationship between magnetism and electrical current was discovered by a Danish scientistnamed Oersted in 1819. He found that if an electric current was caused to flow through aconductor, the conductor produced a magnetic field around that conductor (Figure 21).Figure 21 The Magnetic Field Produced by Current in a ConductorPolarityofaSingleConductorA convenient way to determine the relationship between the current flow through a conductorand the direction of the magnetic lines of force around the conductor is the left-hand rule forcurrent carrying conductors, as illustrated in Figure 22. The student should verify that the left-hand rule holds true for the examples shown in Figure 21.Figure 22 Left-hand Rule for CurrentCarrying ConductorsRev. 0 Page 31 ES-01
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