Uniform electric and magnetic fields with strength E and induction B, respectively, are along y-axis as shown in Fig. A particle with specific charge `q//m` leaves the origin O in the direcction of x-axis with an initial non-relativistic velocity `v_0`

The angle `alpha` between the particle's velocity vector and y-axis at and moment is

Answer

[(a) `2pi^(2)n^(2)mE//qB^(2) `; (b) `tan^(-1)((Bv_(0))/(2piEn))`]