E_{0} = \sqrt{\frac{2 I}{c ε_{0}}} = \sqrt{\frac{2 \times 1, 3610^{3}}{310^{8} \times 8, 8510^{- 12}}} \approx 1000 V m^{- 1} (*)

${E_0=\sqrt{\frac{2I}{c\varepsilon_0}}=\sqrt{\frac{2 \times 1,3610^3}{310^8 \times 8,8510^{-12}}} \approx 1000\, \mathrm{Vm^{-1}} (*)}$

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