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## Main Question or Discussion Point

<Moderator's note: Moved from a homework forum.>

Calculate the required voltage to produce a electric arc between 2 iron nails (distance: 3cm).

I´ve read in the internet that you need 1 kV per mm. But how can I calculate this value, that I need 1kV per 1mm?

Calculate the required voltage to produce a electric arc between 2 iron nails (distance: 3cm).

I´ve read in the internet that you need 1 kV per mm. But how can I calculate this value, that I need 1kV per 1mm?

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