∮D⋅dS=Q\oint D\cdot dS = Q ∮D⋅dS=Q
D=εED = \varepsilon E D=εE
∇2φ=−ρε\nabla^2\varphi = -\frac{\rho}{\varepsilon} ∇2φ=−ερ
∇φ=−E\nabla\varphi = -E ∇φ=−E
w=12E⋅Dw = \frac{1}{2}E\cdot D w=21E⋅D
I=J⋅SI = J\cdot S I=J⋅S
J=αEJ = \alpha E J=αE
∮H⋅dl=I\oint H\cdot dl = I ∮H⋅dl=I
B=μHB = \mu H B=μH
M=Bμ0−HM = \frac{B}{\mu_0} - H M=μ0B−H
∇2A=−μJ\nabla^2 A = -\mu J ∇2A=−μJ
w=12B⋅Hw = \frac{1}{2}B\cdot H w=21B⋅H
e感=BSTe_{\text{感}} = \frac{BS}{T} e感=TBS
e动=BLve_{\text{动}} = BLv e动=BLv
S=E×HS = E\times H S=E×H
x/(x2+y2)3/2 对 y 积分x/(x^2+y^2)^{3/2} \text{ 对 } y \text{ 积分} x/(x2+y2)3/2 对 y 积分
yxx2+y2\frac{y}{x\sqrt{x^2+y^2}} xx2+y2y
y/(x2+y2)3/2 对 y 积分y/(x^2+y^2)^{3/2} \text{ 对 } y \text{ 积分} y/(x2+y2)3/2 对 y 积分
−1xx2+y2-\frac{1}{x\sqrt{x^2+y^2}} −xx2+y21
z/(r2+z2)1/2 对 z 积分z/(r^2+z^2)^{1/2} \text{ 对 } z \text{ 积分} z/(r2+z2)1/2 对 z 积分
r2+z2\sqrt{r^2+z^2} r2+z2