.2 A particle of mass 10 g and charge 80 uC 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 20i km/s, which is perpendicular to the magnetic field. What, then, is the magnetic field? 5. For problem .2, assume a mass of 19.4 g and solve for the required magnetic field, B **in units of mT (miliTesla)***. 5 sig. figs