Acertain charged particle has a charge q > 0. the particle moves with a kinetic energy k in a circular path of radius r in the presence of a uniform magnetic field of magnitude b. (use any variable or symbol stated above as necessary.) (a) what is the speed of the particle? assume the speed is low compared to the speed of light. v = 2ke qbr what is the magnitude of the magnetic force? how is it related to the centripetal force as the particle moves in a circular path? how is the speed related to kinetic energy? (b) what is the mass of the particle? m =