 
 <translate> Quoc: Three discoveries challenged this foundation of magnetism, though. First, in 1819, Hans Christian Ørsted discovered that an electric current generates a magnetic field encircling it. Then in 1820, André-Marie Ampère showed that parallel wires having currents in the same direction attract one another. Finally, Jean-Baptiste Biot and Félix Savart discovered the Biot -- Savart law in 1820, which correctly predicts the magnetic field around any current-carrying wire.

Answer this question based on the passage: who discovered the magnetic field of electric current?
HW Chung: OK, some thoughts: <hau> Quoc: Abubuwa uku da aka gano sun ƙalubalanci wannan tushe na magnetism, duk da haka. Na farko, a shekara ta 1819, Hans Christian Ørsted ya gano cewa wutar lantarki tana haifar da filin maganadisu da ke kewaye da ita. Bayan haka, a shekara ta 1820, André-Marie Ampère ya nuna cewa wayoyi masu kama da juna da suke da igiyoyi a hanya ɗaya suna jawo juna. A ƙarshe, Jean-Baptiste Biot da Félix Savart sun gano dokar Biot - Dokar Savart a 1820, wadda ta faɗi daidai filin magnetic a kusa da kowane waya mai ɗaukar wutar lantarki.  Amsa wannan tambaya bisa ga nassi: wanda ya gano filin magnetic na wutar lantarki? HW Chung: OK, wasu tunani: 