.2 A particle of mass 10 g and charge 80 /C moves through a uniform magnetic field, in a region where the free-fall acceleration is -9.8j m/s . The velocity of the particle is a constant 201 km/s, which is perpendicular to the magnetic field. What, then, is the magnetic field? 2) For problem 2, assume a mass of 10.1 g and solve for the required magnetic field, B, in mT. 5 sig. figs