29 - 29 29-1,2 1 1 2 FB q vB 3 1 tesla = 1 T 1 N Am = 10 4...

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29장. 자기장 29-1,2 자기장 의 정의 1. 자기장 전하가 주위에 전기장을 만드는 것처럼 자석은 주위에 자기장을 만든다. 1) 자기장 만드는 방법 자석(자기쌍극자)을 둠 전류가 흐르는 도선을 둠 2) 자기장의 정의 속도 로 움직이는 전하 는 자기장 속에서 힘을 받음 F B q v × B ( 정의:“자장” {힘,전하,속도} ;  모두에 수직) 3) 단위: 테슬라 1 tesla = 1 T ≡ 1 N/(A⋅m) = 10 4 gauss 4) 여러 상황에서의 자기장의 세기 중성자별의 표면 10 8 T 지구표면 10 - 4 T 커다란 전자석 부근 1.5 T 우주공간 10 - 10 T 작은 막대자석 부근 10 - 2 T 자기장을 차폐시킨 방 10 - 14 T
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2. 자기력선 1) 정의 밀도: 자기력선의 밀도는 B 세기에 비례 ② 방향: 자석의 N 극이 밀려가는 방향 B 의 방향은 자기력선의 접선방향 2) 보기: 막대자석 주위의 자기력선 분포 3) 자석을 잘라도 자극을 분리할 수 없음 3. 자기장에 관한 가우스 법칙 Φ B =
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