12. For two trails in each table, determine the velocity of the electron, calculate the magnitude of the magnetic force, and the period of revolution of the electron while in the circular trajectory. You're your work for one of the trails and Complete Table C. Table C Voltage Radius Magnetic Velocity Magnetic Period V (V) r (m) Field v (") Force T(S) B (T) FB (N) 500 5.5 0.055 1.32*10^-3 393 5 0.05 1.32*10^-3 312 4.5 0.045 253 4 current Radius Magnetic Velocity Magnetic Period (A) A r (m) Field Force T(S) B (T) FB (N) 1.25 5.5 0.055 1.0*10^-3 1.44 5 0.05 1.15*10^-3 1.60 4.5 1.8 4