1. The problem statement, all variables and given/known data These question deal with a mass spectrometer whose slits are separated by .1 m. a) Trying to calibrate it using protons, for B=.2T, the proton starting at rest should be accelerated through a voltage of _________ to have it pass through the two slits. b) To set it with He2+ ions, with 2 protons and 2 neutrons, so that they pass through both slits, they need a voltage of _________. (Take into account a fixed geometry where r and B are constant. c) Assuming that the earth's magnetic field ifs 0.5x10^-4 and is perpendicular to path of particles, how much error is possible using the He2+ particles? 2. Relevant equations 1/2mv^2=qV F = qvB qE = qvB --> 3. The attempt at a solution a) should i use the 3rd equation for this one? b) same equation but change value for q to 2q? c) I have no idea on this one Please help, I'm so lost in this problem.