A particle of charge $q$, mass $m$ enters in a region of magnetic field $B$ with velocity $V_0 \widehat i$. Find the value of $d$ if the particle emerges from the region of magnetic field at an angle $30^o$ to its ititial velocity:-
  • A$\frac{mv_o}{2qB}$
  • B$\frac{mv_o}{qB}$
  • C$\frac{mv_o}{3qB}$
  • D$\frac{mv_o}{4qB}$
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