Denmark Medal (1920) Hans Christian Oersted. Jensen Gunnar (1863-1943). On the Danish physicist; chemist and natural philosopher Hans Christian OERSTED (1777-1851). Obverse: To the 100th anniversary of the discovery of the magnetic effect of electric current. Oersted is considered a co-founder of electricity theory and electrical engineering through his discovery. Reverse: the scientist is sitting at his research station. Silver (.998). Weight approx: 108.61g. Diameter: 55 mm