1. The problem statement, all variables and given/known data As shown in the figure below, potential difference V exists between two parallel plates(a,b) that have a small hole. Uniform electric field E and magnetic flux density B exist in the region above the plates, and are perpendicular to each other. The directionof E is parallel to this page and plate b. The directionof B is perpendicular to this page from back to front. A positiely charged particle of charged q and mass m, initially at res in the hole of plate a, is accelerated by potential difference V so that it enters te region above the plate perpendiculary to E and B and travels straight through the region. http://imageshack.us/photo/my-images/442/imagenq4.png/ http://imageshack.us/photo/my-images/442/imagenq4.png/ What is the ratio E/B? Thanks Please tell me how i put images in the post.