In 2D electrostatics, the saddles of the electric potential from 3 equal point charges are the foci of the biggest ellipse contained in the triangle of the charges Posted on 2021/06/07 by Carl Robitaille Guess what? In 2D electrostatics, the saddles of the electric potential from 3 equal point charges are the foci of the biggest ellipse contained in the triangle of the charges. pic.twitter.com/f9SYYm3SLH— Albert Chern (@theAlbertChern) May 20, 2021