Timeline of Electromagnetism Innovations Using Magnetic Fields By Mary Betlis
Ancient Times: Amber rubbed with fur attracts bits of dust and hairs static electricity spikes on cold, dry days, lightening lode stonecompass. 1600: English scientist William Gilbert, publishes "De Magnete" 1700: Lectures and demonstrations given by various scientists using electricity to attract and entertain audiences
1747 : Ben Franklin (1706-1790) discovers there are two kinds of charges: positive and negative and that like charges repel and unlike charges attract. Franklin also documents conservation of charge an isolated system has constant total charge 5
1785: Charles Austin de Coulomb (1736-1806) documents Coulombs Law F kQ1 Q2 rA2 ~nn k z 9 x 10A9 N mN2/o/2. Coulomb proves that the force between two charges Q1 and Q2 is proportional to their product divided by the separation distance r squared Coulomb discovers the "inverse square law.
1780: Luigi (1737-1790) discovers electricity from two different metals causes frog Galvani legs to twitch. 1790 : Alessandro Volta (1745-1827) finds chemistry acting on two dissimilar metals generates electricity. He later invents the voltaic pile battery.
1820: Hans Christian Oersted (1777-1851) electric current affects compass needle
1820 :Andre Marie Ampere (1775-1836) in Paris finds that wires carrying current produce forces on each other.
1820: Michael Faraday (1791-1867) at Royal Society in London develops idea of electric field and studies the effect of currents on magnets and magnets inducing electric currents. 1860 : James Clerk Maxwell (1831-1879), a Scottish physicist and mathematician, puts the theory of electromagnetism on mathematical basis.
1873: Maxwell publishes "Treatise on Electricity and Magnetism" in which he summarizes and synthesizes the discoveries of Coloumb, Oersted, Ampere, Faraday, et. al. in four mathematical equations. Maxwell's Equations are used today as the basis of electromagnetic theory. Maxwell makes a prediction about the connections of magnetism and electricity leading directly to the prediction of electromagnetic waves. 1885 : Heinrich Hertz shows Maxwell was correct and generates and detects electromagnetic Waves. A 1895 :Guglielmo Marconi puts the discovery to practical use by sending messages over long distances by means of radio signals. i.e. the "Wireless