1. A particle of positive charge q and mass m enters with velocity vj at the origin in a magnetic field B(-k) which is present in the whole space. The charge makes a perfectly inelastic collision with identical particle at rest but free to move at its maximum y-coordinate. After collision the combined charge will move on trajectory: mv where r = 9B mv A) y = qB B) (x+r)*+{y-5) - 4 C) (x-r) +(y-r) =r D) (x-r)' +| y+ 4 2. In region x>0, a uniform and constant magnetic field Bi = 2B,k exists. Another uniform and constant magnetic field B2 = B,k exists in region x