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5.2
Equations setup, recall that…
…the net number of particles streaming through a surface equals the sum of
fluence changes inside the volume (
divergence theorem
):
in-out
,
,
divergence theorem
d
d d
d d
(Gauss, Stokes...
d
d
)
E
E
A
V
N
E
E
Ω
Ω
ΩΦ Ω
Ω Φ Ω
=
=
= ∇
∫
∫
ur
uur
uur
S
V
4