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[" particles accelerated by a P.D."V" propagates from a point "A],[" along the axis of a solenoid.The beam is brought into focus at "],[" a distance "l" fasolenoid.The beam is brought into focus at "],[" magnetic "l" from the point "A" 'at two successive values of "],[" magnetic induction "B_(1)" and "B_(2)" .Find the specific charge "q/m" of "],[" (IT-JEE,"2007" ) "]

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