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R - Giulio Raganelli homepage

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U = e ⋅ E ⋅ λ ≈ 1 ÷ 10 eV<br />

E ≈<br />

Per campi elettrici di tale valore<br />

l’aria cessa di essere un isolante<br />

e diviene un conduttore<br />

Una semplice<br />

applicazione: il<br />

parafulmine<br />

È difficile ottenere simili<br />

campi elettrici?<br />

1 ÷ 10<br />

λ<br />

≈ 10 6 ÷ 10 7 V/m

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