An $\alpha$-particle of mass $m$ moves on a circular path of radius $r$ in a plane inside and normal to a uniform magnetic field $B$. The time taken by this particle to complete one revolution is . . . . . . .
- A$\frac{4 \pi m}{e B}$
- B$\frac{8 \pi e^2 B}{m}$
- C$\frac{4 \pi e B}{m}$
- D$\frac{\pi m}{e B}$
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