Hey yall: So I ran across this confusing question and was wondering if you guys could help me out. Consider the fact that you have a positive particle (which would be q=1.6E-19) that is traveling at 1.9E4 m/s perpendicular to a 1.0 x 10-3 T magnetic field. If the radius is .40m what is the particles mass? I don't understand how the 1.0 x 10-3 T can be used in any calculation! Is that just 1.0E8 T, or am I really missing something? Any formulas would be appreciated.