资料介绍
电磁感应1q
qP
° q qy w (Biot-Savart Law) w°w (Ampere‘s Law) q§ w° -°¨§Jw(Ampere-Maxwell Law) ° q q§Pq¤q° kw (Faraday’s Law) ° ¨ § J ¤ è { (Maxwell’s Equations)--- n ¤ §
¤¤¤jz¨t ]¤Z
qP¤@ -1
q
qy
(Biot-Savart Law) w°w (Ampere‘s Law)
w
w (Biot-Savart Law) êiH±o¨ì
dB =
0 ids × r 4π r 3
∈
dB =
0
4π
ids sin θ r2
0=4π× 10-7 Tm/A ≈ 1.26× 10-6 Tm/A permeability constant v `NG dB⊥ds, r Mw¨w§¤ dE = 1 dq 4πε0 r 2 dE = 1 dq r 4πε 0 r3
ΜΖ∞↑Χ ¤¤¤jz¨t ]¤Z qP¤@ -2
1
q
uqyy¨¤§
B=
dB = 0 Ids sin θ 4π r2
∞
0 I 2πa
B = 2 ∫0 dB = r = s 2 + a2 , B = 2 ∫ dB =
0 ∞
0I 2π
∫
∞
0
sin θds r2 a s + a2
2
sin θ = sin(π θ) = 0 I 2π
∫ (s
0
∞
ads
2
+a2
)
3/ 2
I s = 0 2 2 2πa s +a
(
)
I = 0 1/ 2 0 2πa
∞
¤¤¤jz¨t ]¤Z
qP¤@ -3
q
n¤-pG
s = a tan θ,
(s
+ a
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