1. Problem - Notes Jumbled, do not know if I am missing variables or not needed to answer the questions? Disclaimer: I am good at maths, fine with algebra and derivations, I just forget the formulae and units, especially when I haven't practiced things a lot, such as this topic (other subjects getting in the way...) Diagram: http://imgur.com/mDBqZN5 The variables I am given are d = 8cm cm, and V = 200 V, m = 2.86E-16. I have access to the mass and charge of an electron/ proton. Here are the ten questions I need to be able to answer: Gravitational force on the particle Electrical force on the particle Electric field strength between... plates? The charge of the object Number of excess proton particles Power difference - changed to 201V: The new field strength [*]The new electric force [*]The net force [*]The acceleration [*]The time it will take from... 2. Relevant equations * The equations of motion. * Electrostatic equations, such as E = V / d, E = F / q, V = w / q, Work done = Fd = qV = qED. 3. My attempt at a solution My apolegies, I was confused about numerous things, some are solved now, but I haven't done much since I started, but I still don't understand what other proton particles are being referred to. Edit: Okay. 1. Gravitational strength? How is Gravity taking place here? 2. F = Eq but E = V / d F = qV / d = 1.6E-31 * 200 / 0.08 F = 4E-28 N But I don't get the diagram, is that halfway, so it's 0.04? I know it's my diagram, but I thought this would be a common question. 3. E = V / d [?] E = 200 / 0.08 [or is it 400 or 0.04 or both?] E = 2500 N.C^-1 [Is this an overly high value?] 4. What object?.. I have a feeling this is my rubbish note-taking's fault. Maybe it wasn't an electron, in fact, I just realised the mass is about 10^15 times higher than an electron... I'm lost.