1. The problem statement, all variables and given/known data There are two parts to the question. A)Why is gravity not important during JJ Thomsons experiment? b)what is the deflection due to gravity? Given variables. In a thomson spectromoter set at 10^4 (V/m). deflection with out the magnetic field applied equals .10 radians over a L of .050 m. Speed of electron with magnetic field applied is 2.9x10^7 m/s. Strength of Magnetic field is 3.4x10^-4 T. 2. Relevant equations I don't know what they are.... 3. The attempt at a solution A) in the experiment the effects of gravity were negated by the application of a magnetic field perpendicular to that of the electric field, to help over come any deflection caused by gravity. B) I really don't know how to go about this. EDIT: I thought about it a little more...would I just be using the velocity, time distance and deflection angle to solve this?? Like...a particle fired at a zero degree angle?