1. The problem statement, all variables and given/known data What is the magnitude of the force experienced by a He2+ ion travelling with v = 1.3 × 10^5i m/s in a magnetic field B = 0.42 j T? 2. Relevant equations F=qvbsinθ 3. The attempt at a solution F=2*1.6e-19*1.3e5*0.42 I am unsure about the charge on the Helium ion. Is it 2*1.6e-19?