Alright I'm learning the same stuff right now so I should be able to help. The thing to remember is that these are not to be added as vectors. The positive charge q that is a distance d from point p will cancel out one of the -q charges that is a distance d from point p. So you will need to find...
That is not a bad thought but you are forgetting that if the Normal Force is less than 1, and if static friction is indeed divided by normal force to obtain kinetic friction, then the kinetic friction could, by definition, be greater than static friction.
By the way, isn't the static friction...