1. The problem statement, all variables and given/known data Given: see attachment Five additional electrons are placed at the origin. What is the electric field now. 2. Relevant equations Electric field equations of E=q/(4pi*Eo*r^2) 3. The attempt at a solution I am wondering if the electric field would just be 50% higher because of adding five electrons. However I am somewhat confused by the fractions in the parenthesis. I know that the electric field is going to be a summation of the charges relative to the distance from a point. I am just unsure how to apply that thought in this case due to my misunderstanding of those fractions in the parenthesis. Thanks!