2) A charged particle is moving through a uniform magnetic field of strength 3.0 T. The path it traces is a circle with radius 15.0cm. a) If the period of rotation for this particle is 2.5ms, what is the charge-to-mass ratio of this particle? (3 pt) b) What is the velocity of this particle? (2 pt). c) If instead of a circle, the particle shows helical motion with a pitch of 10.0 cm, what is the angle between the velocity and magnetic field? (2 pt)