安培环路定律 磁感应强度的旋度: ●磁感应强度: R 旋度:V×)=VxVx[Jr) 4πJpR V×V×A=7(V.A-VA 口xr)=V]:p0 R R 0.2=jwv。-jr- R R R =-.J02+J62 vJ()=J(r)V R R R R -'.J =-4πJ(r)6(f-产) R x=L-p24r-rr R lexu@mail.xidian.edu.cn 20 安培环路定律 磁感应强度的旋度: 磁感应强度: 旋度: 0 ( ') ( ) ' 4 V J r B r dV R µ π =∇× ∫ 0 ( ') ( ) [ '] 4 V J r B r dV R µ π ∇× =∇× ∇× ∫ 0 0 2 ( ') ( ') ( ) ' ' 4 4 V V J r J r B r dV dV R R µ µ π π ∇× =∇ ∇⋅ − ∇ ∫ ∫ 2 ∇×∇× =∇ ∇⋅ −∇ A AA ( ) ( ') 1 1 ( ') ( ') ( ') ( ') ( ') J r Jr Jr RRR Jr Jr R R J r R ∇⋅ = ⋅∇ = − ⋅∇′ ∇ ⋅′ = −∇ ⋅ + ′ = −∇ ⋅′ 2 2 ( ') 1 ( ') 4 ( ') ( ) J r J r R R π δ Jr r r ∇ =∇ =− − ′ 0 0 ( ') ( ) ' ( ') ( ) ' 4 V V J r B r dV J r r r dV R µ µ δ π ∇ × = ∇ −∇ ⋅ + ′ ′ − ∫ ∫ XIDIAN UNIVERSITY LEXU@MAIL.XIDIAN.EDU.CN