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[" 3Two 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 "theta" 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 "],[" (B) "2 pi M" v "cos theta/QB],[" (C) "pi M" v "cos theta/QB],[" (D) "4 pi M" v "cos theta/QB]

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