{"title":"安培定律","authors":"Ampere, AMPERE’S Law","doi":"10.1002/0471743984.vse0371","DOIUrl":null,"url":null,"abstract":"BACKGROUND: Biot-Savart Law: In 1820 while preparing for a lecture demonstration Danish Professor Hans Christian Oersted made the accidental discovery that moving electric charge -an electric current -produces a magnetic field. This discovery provided an unexpected link between the phenomena of electricity and magnetism which had been previously regarded as unrelated. The Biot-Savart law (also, less frequently, called the differential form of Ampere’s law) tells how to calculate the magnetic field due to a current i. According to this law the magnetic field dB produced at a point P separated a distance r from a length ds of a wire carrying a current I is given by:","PeriodicalId":314610,"journal":{"name":"Introduction to Electromagnetic Waves with Maxwell's Equations","volume":"32 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2021-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":"{\"title\":\"Ampere's Law\",\"authors\":\"Ampere, AMPERE’S Law\",\"doi\":\"10.1002/0471743984.vse0371\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"BACKGROUND: Biot-Savart Law: In 1820 while preparing for a lecture demonstration Danish Professor Hans Christian Oersted made the accidental discovery that moving electric charge -an electric current -produces a magnetic field. This discovery provided an unexpected link between the phenomena of electricity and magnetism which had been previously regarded as unrelated. The Biot-Savart law (also, less frequently, called the differential form of Ampere’s law) tells how to calculate the magnetic field due to a current i. According to this law the magnetic field dB produced at a point P separated a distance r from a length ds of a wire carrying a current I is given by:\",\"PeriodicalId\":314610,\"journal\":{\"name\":\"Introduction to Electromagnetic Waves with Maxwell's Equations\",\"volume\":\"32 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2021-09-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Introduction to Electromagnetic Waves with Maxwell's Equations\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1002/0471743984.vse0371\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Introduction to Electromagnetic Waves with Maxwell's Equations","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/0471743984.vse0371","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
BACKGROUND: Biot-Savart Law: In 1820 while preparing for a lecture demonstration Danish Professor Hans Christian Oersted made the accidental discovery that moving electric charge -an electric current -produces a magnetic field. This discovery provided an unexpected link between the phenomena of electricity and magnetism which had been previously regarded as unrelated. The Biot-Savart law (also, less frequently, called the differential form of Ampere’s law) tells how to calculate the magnetic field due to a current i. According to this law the magnetic field dB produced at a point P separated a distance r from a length ds of a wire carrying a current I is given by:
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