$A$ particle with charge $q$,moving with a momentum $p$,enters a uniform magnetic field normally. The magnetic field has magnitude $B$ and is confined to a region of width $d$,where $d < \frac{p}{Bq}$. The particle is deflected by an angle $\theta$ in crossing the field.

• A
  $\sin \theta = \frac{Bqd}{p}$
• B
  $\sin \theta = \frac{p}{Bqd}$
• C
  $\sin \theta = \frac{Bp}{qd}$
• D
  $\sin \theta = \frac{pd}{Bq}$