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k


e






=


1

4
π

ε

0





=




c

2




μ

0




4
π



=

c

2


⋅

10

−
7




H

⋅


m


−
1








=
8.987

551

787

368

176

4
×

10

9




N
⋅

m

2


⋅

C

−
2



.






{\displaystyle {\begin{aligned}k_{\mathrm {e} }&={\frac {1}{4\pi \varepsilon _{0}}}={\frac {c^{2}\ \mu _{0}}{4\pi }}=c^{2}\cdot 10^{-7}\ \mathrm {H} \cdot \mathrm {m} ^{-1}\\&=8.987\ 551\ 787\ 368\ 176\ 4\times 10^{9}\ \mathrm {N\cdot m^{2}\cdot C^{-2}} .\\\end{aligned}}}

