The relationship between electricity and magnetism was discovered by the scientist Michael Faraday in the 19th century.
Hans Christian Ørsted discovered the relationship of electric current to magnetism.
Michael Faraday
Danish physicist Hans Christian Oersted by far!
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Who were the first to discover a substance with magnetic properties
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Magnesia
It was discovered in the stone age. Magnetic stones 'Lodestones' were used for navigation for years.
A notable series of investigations of the relationship between electricity and magnetism was conducted almost in parallel in England by Michael Faraday and in America by Joseph Henry. Both Faraday and Henry discovered the principle of the dynamo in 1830-31, for example. Although they independently discovered many of the same connections and devices, Faraday's work was to have the greater theoretical impact while Henry's had more immediate practical application.
Electro-Magnetism was just discovered. Antibiotics had not been.