I used the equation E= kqd/(L^3) L=sqrt(h^2+(d/2)^2) I got the first answer (for P1). I can't figure out how to utilize that equation for P2. The second question asks: "What is the magnitude of the electric field at P2? Answer in units of N/C" what's the value of L (-100... -101.1 or something totally different)... I don't quite understand the variables in the given equation. Help is most appreciated. thx.