419. assignment (charged particle in the magnetic field)
A charged particle moves into a region of uniform magnetic field B, goes through half a circle and then exits the region. The particle is either a proton or an electron. It spends 3.0 uS (3.0 × 10-6 s) in the region. If the particle is sent back through the magnetic field but with 3.0 times its previous kinetic energy, how much time does it spend in the field during the new trip? What is the particle?
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