磁场 电流毕與萨伏尔定徫.磁奶,酥路定醒.安培定徫.洛仑兹力) ∫j()45J=n at at 2 J=oE Pj=E ne B=4rld×11×(=F") 4I r- 4T3 I B 10lR210m1 2T 2z3-2z3
磁场 (电流, 毕奥萨伐尔定律, 磁场, 环路定理, 安培定律, 洛仑兹力) dq i dt = i j r ds = ( ) ( ) ( , ) v q j r ds r t dr t t = − = − d j nqv = j E j E = = 2 ne m = 0 0 2 3 ˆ ' ( ') 4 4 | '| Id r jdr r r B r r r − = = − 0 2 I B = 2 0 0 3 3 1 1 2 2 Z IR m B Z Z =
∮BD=H=Hd5 B·dS=0 dF,=A2dC2×(1d1×2)=ld2×dB 4丌 F=F+FB=qE+qr×B
0 2 2 1 1 21 21 2 2 2 21 ( ) ˆ 4 I d I d r dF I d dB r = = 0 0 S B dl I j ds = = F F F qE qv B = + = + E B B ds = 0