Two particles of charges `+Q` and `-Q` are projected from the same point with a velocity v in a region of unifrom magnetic filed `B` such that the velocity vector makes an angle 0 with the magnetic filed Their masses are `M` and `2M` respectively Then, they will meet again for the first time at a point whose distane from the point of projection is .A. `2piMvcos0//qB`B. `8piMvcos0//qB`C. `piMvcos0//qB`D. `4piMv cos 0//qB`

Two particles of charges `+Q` and `-Q` are projected from the same poi

1.	Two particles of charges `+Q` and `-Q` are projected from the same point with a velocity v in a region of unifrom magnetic filed `B` such that the velocity vector makes an angle 0 with the magnetic filed Their masses are `M` and `2M` respectively Then, they will meet again for the first time at a point whose distane from the point of projection is .A. `2piMvcos0//qB`B. `8piMvcos0//qB`C. `piMvcos0//qB`D. `4piMv cos 0//qB`
Answer» Correct Answer - D `T_(1) = (2piM)/(qB) T_(2) = (2pi(2M))/(qB)impliesT_(2)=(4piM)/(qB)` they will meet again when first will complete two revolution and second will complete one revoluation so direction `d =v cos thetat = vcostheta.2 (2piM)/(qB) = (4piMvcostheta)/(qB)` .

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