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An electron is projected with velocity $\vec v$ in a uniform magnetic field $\vec B$ . The angle $\theta$  between $\vec v$ and $\vec B$  lines between $0^o$ and $\frac{\pi}{2}$ . It velocity $\vec v$ vector returns to its initial  value in time interval of 

• ✓
  $\frac{2 \, \pi m}{eB}$
• B
  $\frac{ \pi m}{eB}$
• C
  $\frac{ \pi m}{2\,eB}$
• D
  Depends upon angle between $\vec v$ and $\vec B$