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An electron of mass me initially at rest moves through a certain distance in a uniform electric field in time t1. A proton of mass mp also initially at rest takes time t2 to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of t2/ t1 is nearly equal to 

(1) 1

(2) (mp/me)1/2

(3) (me/mp)1/2

(4) 1836