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Quiz14-2007-102

# Quiz14-2007-102 - trajectory c If positive particle and the...

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a) Draw the force vector that is acting on each particle. Right hand rule provides the solution: For +q : Thumb points in the velocity direction, to the right. Other fingers stretch in the direction of B, into the page. Palm shows the direction of force that is acting on positive charge, its direction is upward. For -2q : Thumb points to the left direction. Fingers are again stretched in the direction of B, that is into the page. Palm shows the direction of force that would act on a positive charge, but here the charge is negative, so force’s direction is upward. b) Draw the approximate trajectories of both particles, indicating the direction of motion on the
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Unformatted text preview: trajectory. c) If positive particle and the negative particle have charges +q and -2q respectively, what should be that ratio of their masses so that their motion has the same period? ( ) ( ) ( ) ( ) ( ) 3 ........ 2 2 2 ........ 2 1 . .......... 2 2 1 1 2 2 2 2 2 1 2 1 1 1 v R v R T R v m B qv R v m B qv π = = = = From (3), 2 2 1 1 v R v R = . Substituting this into (1) and (2) respectively; 2 1 2 2 2 2 1 2 1 2 2 2 2 2 2 1 1 1 1 1 1 = = = = = = m m qB m qB m qB m v R R v m qB qB m v R R v m qB...
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