In lecture #2, time 11:20 Proff. Lewin wants us to calculate when will the field be zero on the line passing through two charges +3 and -1 respectively.
I calculated and the answer was that point is at distance d(3+3^.5)/2 OR d(3-3^.5)/2 from the +3 charge, and d is the distance between the two charges. I got two results cause I was solving a quadratic equation, but the second result is clearly wrong because it places the zero field point between the two charges. Can anyone check my solution?

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