A positively charged particle of mass 7.2x10^-8 kg istraveling due east with a speed of 85 m/s and enters a 0.31-Tuniform magnetic field. The particle moves through one- quarter ofa circle in a time of 2.2x10^-3 s, at which time it leaves thefield heading due south. All during the motion the particle movesperpendicular to the magnetic field.
(a) what is the magnitude ofthe magnetic force acting on the particle?
(b) Determine the magnitude of its charge?