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**1. A force of 9.2x10**

^{-14}acts on an unknown particle that travels at 2.40x10^{6}m/s into a magnetic field of 4.8x10^{-2}T. How many elementary charges does this particle carry?I've used F

_{m}=qvB and found q=F

_{m}/vB and got an answer of q=7.986 x10

^{-19}C. I'm not sure where to go from here. I assume I have to divide by the elementary charge... but I don't know what that is. Haha.

**2. An alpha particle with a charge of 3.20x10**

^{-19}C and a mass of 6.65 x10^{-27}kg is travelling at 5.0 x10^{6}m/s. When it enters a magnetic field of 6.4 x10^{-2}T, a magnetic force provides the centripetal force for the alpha particle. The centripetal force causes the alpha particle to travel in a circular path. Calculate the radius of the circular path.Do I simply use the equation r=(mv)/(qB)?