a charged particle moves into a region of uniform magnetic field, goes through half a circle, and then exits that region.The particle is either a...

a charged particle moves into a region of uniform magnetic field, goes through half a circle, and then exits that region.The particle is either a proton or an electron (you must decidewhich). It spends 107 ns in the region. (a) Whatis the magnitude of ? (b) If the particle is sent back throughthe magnetic field (along the same initial path) but with 3.53times its previous kinetic energy, how much time does it spend inthe field during this trip?