Aparticle of massmand chargeqenters a region of uniform magneticfieldb=b0ˆz. the field region extends fromx= 0 tox=l, and is effectively infinitein theydirection. the particle is initially traveling along thexaxis. after the particleleaves the magnetic field region, it is observed to have been bent by an angleθ < π2towardthe−yaxis.
a.) is the particle’s charge positive or negative?
b.) what was the particle’s initial momentum?