{"title":"电磁感应","authors":"Adrian Waygood","doi":"10.1201/9781351190435-19","DOIUrl":null,"url":null,"abstract":"THEORY: Electromagnetic induction is the process in which a magnetic field causes or INDUCES an electric field. However, a \"static\" magnetic field will not do this; it takes a CHANGING magnetic field. A changing B-field can be produced in several ways: (1) the current producing the B-field can change, (2) the source of the field (electromagnet or permanent magnet) can be in motion, or (3) the frame of reference in which the B-field is being observed can be in motion. The induced electric field exists only while the change is occurring. If there is no change, then there is no induction.","PeriodicalId":118591,"journal":{"name":"An Introduction to Electrical Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Electromagnetic induction\",\"authors\":\"Adrian Waygood\",\"doi\":\"10.1201/9781351190435-19\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"THEORY: Electromagnetic induction is the process in which a magnetic field causes or INDUCES an electric field. However, a \\\"static\\\" magnetic field will not do this; it takes a CHANGING magnetic field. A changing B-field can be produced in several ways: (1) the current producing the B-field can change, (2) the source of the field (electromagnet or permanent magnet) can be in motion, or (3) the frame of reference in which the B-field is being observed can be in motion. The induced electric field exists only while the change is occurring. If there is no change, then there is no induction.\",\"PeriodicalId\":118591,\"journal\":{\"name\":\"An Introduction to Electrical Science\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2018-08-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"An Introduction to Electrical Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1201/9781351190435-19\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"An Introduction to Electrical Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1201/9781351190435-19","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
THEORY: Electromagnetic induction is the process in which a magnetic field causes or INDUCES an electric field. However, a "static" magnetic field will not do this; it takes a CHANGING magnetic field. A changing B-field can be produced in several ways: (1) the current producing the B-field can change, (2) the source of the field (electromagnet or permanent magnet) can be in motion, or (3) the frame of reference in which the B-field is being observed can be in motion. The induced electric field exists only while the change is occurring. If there is no change, then there is no induction.
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