Two particles of charges $+Q$ and $-Q$ are projected from the same point with a velocity $v$ in a region of uniform magnetic field $B$ such that the velocity vector makes an angle $q$ with the magnetic field. Their masses are $M$ and $2M,$ respectively. Then, they will meet again for the first time at a point whose distance from the point of projection is
Two particles of charges $+Q$ and $-Q$ are projected from the same point with a velocity $v$ in a region of uniform magnetic field $B$ such that the velocity vector makes an angle $q$ with the magnetic field. Their masses are $M$ and $2M,$ respectively. Then, they will meet again for the first time at a point whose distance from the point of projection is
- A
$2\pi Mv \,\,cos\theta\, Q/B$
- B
$8\pi Mv \,\,cos\theta \,Q/B$
- C
$\pi Mv\,\, cos\theta \,Q/B$
- D
$4\pi Mv\,\, cos\theta \,/QB$
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