A positively charged particle of mass 6.20 multiply.gif 10-8 kg is traveling due east with a speed of 50 m/s and enters a 0.46-T uniform magnetic field. The particle moves through one-quarter of a circle in a time of 1.00 multiply.gif 10-3 s, at which time it leaves the field heading due south. All during the motion the particle moves perpendicular to the magnetic field.
(a) What is the magnitude of the magnetic force acting on the particle?
___________N
(b) Determine the magnitude of its charge.
____________C