1. The problem statement, all variables and given/known data So a quarter circle has a total charge of 25μC and has a 1m radius. I need to find the resultant electric field at point P. 2. Relevant equations The Y components will cancel here due to symmetry so we are left only caring about the x components. dE= (kdq)/(r^2) rˆ dq= λdl 3. The attempt at a solution I don't have a value for lambda, so... dq= λdl Q= ∫λdl from 0 to (pi * r / 2) because 1/4 of 2*pi*r Q= λ∫dl 25uC = λ*pi*1/4 λ= 31.83uC/m k/r^2 * q = E (9*10^9)/(1^2) * 31.83 = 2.86*10^11 The answer is really E = 2.03*10^5 N/C I know I'm going wrong at the integration but I don't know how to solve it.