In the figure, a charged particle moves into a region of uniform magnetic field B ,goes through half a circle, and then exits thatregion. The particle is either a proton or an electron (you must decide which). It spends 127 ns in the region. (a) What is the magnitudeof B (b) If the particle is sent back through the magnetic field (along the same initial path) but with 4.89 times its previous kineticenergy, how much time does it spend in the field during this trip?O B

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