1. The problem statement, all variables and given/known data Suppose a free electron in air is 1.1cm away from a point charge. What minimum charge must this point charge have to cause a breakdown of the air and create a spark? I already have the Electric field and force, which I solved to be E=7.2x10^6 N/C F=1.2x10^-12 N 2. Relevant equations F=(k*q1*q2)/r^2 f=Eq 3. The attempt at a solution I tried using F=kq1q2 / r^2 and plugging in .011m in as r and then using q1=q2=charge of electron. Then I did F=Eq and solved for q but i did not get the correct answer. How should I be approaching this problem?