Electric arc: How to calculate the required voltage for a light bow?

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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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berkeman
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<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?
Welcome to the PF. :smile:

See if this helps: https://en.wikipedia.org/wiki/Paschen's_law

What is your background in working with high voltages?
 

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