A positively charged particle having charge q is accelerated by a potential difference V. This particle moving along the x-axis enters a region where an electric field E exists. The direction of the electric field is along positive y-axis. The electric field exists in the region bounded by the lines x=0 and x=a. Beyond the line x=a (i.e. in the region x≥a) there exists a magnetic field of strength B, directed along the positive y-axis. Find
(a) at which point does the particle meet the line x=a
(b) the pitch of the helix formed after the particle enters the region x≥a . Mass of the particle is m .