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A Century of Electromagnetic Discovery   1751 Franklin—iron needles magnetized by an electric discharge 1781 Coulomb—1/r2 law of electric force Force between charges is proportional to product of the charges divided by square of the distance between them F = q1q2/r2 1789 Aepinus—capacitor 1791 Galvani—electric current from frog 1800 Volta—battery 1820 Oersted-–magnet causes current-carrying wire…