Finding period of revolution of an electron (fairly urgent)? 1. The problem statement, all variables and given/known data A doubly ionized atom (charge = +2e) whose mass is 3.65E-26 kg is accelerated by a voltage of 3950.0 V and enters a region where a uniform magnetic field B = 0.0500 T acts perpendicular to its motion. a) What is the radius of curvature of the path of the ion in the B-field? b) What is its period of revolution? 2. Relevant equations F=QvB F=m4pi2r/T2 F=mv2/r 3. The attempt at a solution I did the first part, the correct answer is 0.601 m. I've tried a few different methods for b), I won't list them all. I rearranged the third equation for v, plugged it into the first equation, plugged that into the second equation and rearranged for T. T=√(4π2m2/(Q2B2)) Solved that for 0.0000143156 s No idea if this is right or not, but I doubt it because I think I need to use voltages and energies, but that didn't work when I tried it.