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The largely self-educated Ampère began his career as a teacher of science in France, and by 1808 had become Inspector General of the French university system.
In 1814 he provided independent verification of Avogadro's Law, but his most important work, beginning in 1820, developed Hans Christian Oersted's work on the relationship between magnetism and electricity. Ampère's Law, formulated in that year and derived from his discovery that an electric current will cause a magnetic needle to move, describes the magnetic field produced by a conductor carrying a current.