Once inside the magnetic field all the necessary forces on

Question

Two isotopes of cabon, C¹² and C¹³ traveling with the same velocity move through a isotope has a charge e = 1.6 x 10^-19 C and enters a mass spectrometer in which the magnetic field B is 0.85 T. The ions then travel along a circular path inside the spectrometer. Given that 1 amu = 1.66 x 10^-27 kg

a) Calculate the speed of each isotope before entering the mass spectrometer.

b) Once inside the magnetic field, all the necessary forces on the ions are assumed balanced. Based on this information calculate the radius of the path of each of the isotope in the spectrometer.