1. The problem statement, all variables and given/known data Electrons first run through an accleration voltage of U = 25 kV before entering an homogenous magnetic field which is perpendicular to the electron beam (B=6*10-3 T). The starting velocity of the electrons shall be zero. What is the deflection angle α, if the magnetic field has a length of 5 cm (This means that the magnetic field stretches out for 5 cm in front of the electron accelerator)? 2. Relevant equations 0.5*m*v2=e*U can be transformed to give the velocity of the electrons. q*(v x B) is the Lorentz force. (Or also: FL = q*v*B) 3. The attempt at a solution From the first equation I know that the velocity of the electron is 9.376*107 m/s. That gives a Lorentz force of 9.001*10-14 N. But how can I get the angle? I read somewhere that the tangent could be important, but I don't know how :(.