E.H. Hall's article, "On a New Action of the Magnet on Electric Currents," published in 1880, explores the interaction between magnets and electric currents. Hall's work builds on previous research, particularly Maxwell's and Edlund's, which suggested that a magnet might affect the current itself rather than just the conductor. Hall conducted experiments to test this hypothesis using a spiral of German-silver wire placed between the poles of an electromagnet. The initial results indicated no significant change in the resistance of the coil, suggesting that the magnet's action did not alter the current's path or strength. However, Hall then conducted further experiments using a gold-leaf galvanometer to measure potential differences across the conductor. These experiments revealed a permanent deflection of the galvanometer needle, indicating that the current was pressed, but not moved, towards one side of the conductor. Hall interpreted this as evidence that the magnet's action created a new electromotive force perpendicular to the primary electromotive force, which could be detected when the circuit was completed by the galvanometer. Hall concluded that the magnet's action on the current was proportional to the product of the magnetic field strength and the current through the conductor. He also noted that the transverse electromotive force was proportional to the magnetic field intensity and the velocity of the current, providing a quantitative relationship between these factors. Hall's work laid the groundwork for understanding the complex interactions between magnets and electric currents.E.H. Hall's article, "On a New Action of the Magnet on Electric Currents," published in 1880, explores the interaction between magnets and electric currents. Hall's work builds on previous research, particularly Maxwell's and Edlund's, which suggested that a magnet might affect the current itself rather than just the conductor. Hall conducted experiments to test this hypothesis using a spiral of German-silver wire placed between the poles of an electromagnet. The initial results indicated no significant change in the resistance of the coil, suggesting that the magnet's action did not alter the current's path or strength. However, Hall then conducted further experiments using a gold-leaf galvanometer to measure potential differences across the conductor. These experiments revealed a permanent deflection of the galvanometer needle, indicating that the current was pressed, but not moved, towards one side of the conductor. Hall interpreted this as evidence that the magnet's action created a new electromotive force perpendicular to the primary electromotive force, which could be detected when the circuit was completed by the galvanometer. Hall concluded that the magnet's action on the current was proportional to the product of the magnetic field strength and the current through the conductor. He also noted that the transverse electromotive force was proportional to the magnetic field intensity and the velocity of the current, providing a quantitative relationship between these factors. Hall's work laid the groundwork for understanding the complex interactions between magnets and electric currents.