Q 12-01-136JEE MainJEE Main 2020 (2 Sep, Shift 2)Medium
A small point mass carrying some positive charge on it, is released from the edge of a table. There is a uniform electric field in this region in the horizontal direction. Which of the graphs shown then correctly describes the trajectory of the mass? (Curves are drawn schematically and are not to scale)
Answer: (D) Graph (D)
The mass starts from rest and the net force on it (weight $mg$ plus horizontal $qE$) is constant in magnitude and direction.
A body starting from rest under a constant force moves along the direction of that force, so the path is a straight line, as in graph (D).
Solution by Sreeraj P, M.Sc Physics