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- If you look at the formula for the electric force, you notice that it's remarkably similar to that for gravity, just with masses and charges swapped.
In the 1810s, Simeon Denis Poisson, one of Lagrange's students also noticed the similarity.
And he realized that you can define an electric potential phi in a very similar way.
Listen to native speakers pronounce “1810s” in real conversational contexts with synchronized timestamps and subtitles.