1. The problem statement, all variables and given/known data A proton (m=1.67x10^-27) is suspended at rest in a uniform electric field E. Take into account gravity and determine E. 2. Relevant equations F_{E}=|q|E F_{g}=mg 3. The attempt at a solution F_{G} = mg F_{G} = (1.67x10^{-27})(9.8) F_{G} = 1.64 x 10^{-26} Since the force on the proton due to the E field is equal and opposite, then: F_{E}=|q|E F_{E} / q= E (1.64x10^{-26}) / (1.6x10^{-19}) = E 1.04x10^{-9} = E Is my work correct? 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution