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JEE MAIN 2021
20-07-2021 - S1
Question
A body having specific charge 8 $\mu \mathrm{C} / \mathrm{g}$ is resting on a frictionless plane at a distance 10 cm from the wall (as shown in the figure). It starts moving towards the wall when a uniform electric field of 100 V/m is applied horizontally towards the wall. If the collision of the body with the wall is perfectly elastic, then the time period of the motion will be ______ s.
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