Physics Magnetism,Magnetic Effects Of Current Level: Misc Level

A charged particle moves through a velocity selector at a constant speed in a straight line. The electric field of the velocity selector  is 4.25x103 N/C, while the magnetic field is 0.360 T. When the electric field is turned off, the charged particle travels on a circular path whose radius is 4.45 cm. Find the charge-to-mass ratio of the particle. C/kg