1. The problem statement, all variables and given/known data The electrons in the beam of a television tube have an energy of 23.0 keV. The tube is oriented so that the electrons move horizontally from west to east. At the electron's latitude the vertical component of the Earth's magnetic field points down with a magnitude of 57.6 T. What is the direction of the force on the electrons due to this component of the magnetic field? 2. Relevant equations 3. The attempt at a solution The options are up, down, north, south, west,east. I chose north because B is down(middle finger), pointer finger horizontal and therefore thumb points north. Why is that wrong?