physics
posted by Kelly .
An ionized helium atom has a mass of 6.6*10^27kg and a speed of 4.4*10^5 m/s. The atom moves perpendicular to a 0.75T magnetic field on a circular path of radius 0.012m. Determine whether the charge of the ionized helium atom is +e or +2e.
Can anyone please give me some ideas to do it? Thanks!

Centripetal force=mv^2/r that has to equal Bqv, right? solve for q

i solved it the way you mentioned. the only thing i did was that i changed M from kg to g