NEET 2018 Physics question
An electron falls from rest through a vertical distance in a uniform and vertically upward directed electric field . The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance . The time of fall of the electron, in comparison to the time of fall of the proton is
Answer: (3)
Solution
For the electron the upward field gives a downward force (negative charge), so it falls with . After the field is reversed (downward), the proton also feels a downward force , so . From , . The electron and
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