Four identical positive charges are each launched with a speed v_e from a point

Question

Four identical positive charges are each launched with a speed v_e from a point halfway between the plates of a parallel-plate capacitor. Charge A is launched towards the negative plate, charge B is launched parallel to the plates, charge C is launched ata 45 degree angle toward the positive p;ate, and charge D is launched directly towards the positive plate. Neither charge C nor D touches the positive plate. Rank the speeds of the charges A-D just before they hit the negative late. Greatest least OR, the speed is the same for all four charges. OR, the ranking for the speeds cannot be determined.

Explanation / Answer

order of greatest to lowest speeds: A>B>C>D (If launched with some speed)

REASON: opposite charges attract each other and like charges repell each other. Hence A already directed would have maximum speed and so on..

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