57. A particle with mass m and charge q, moving with a velocity v, enters a region of uniform magnetic field B, as shown in thefigure below. The particle strikes the wall at a distance d from the entrance slit. If the particle’s velocity stays the same but itscharge-to-mass ratio is doubled, at what distance from the entrance slit will the particle strike the wall?
(A) 2d
(B)
(C) d
(D)
(E)