An electron having charge `e` and mass `m` starts from the lower plate of two metallic plates separated by a distance `d`. If the potential difference between the plates is `V`, the time taken by the electron to reach the upper plate is given by .A. `sqrt((2 m d^2)/(e V))`B. `sqrt(( m d^2)/(e V))`C. `sqrt(( m d^2)/(2 e V))`D. `(2 m d^2)/( e V)`

An electron having charge `e` and mass `m` starts from the lower plate

1.	An electron having charge `e` and mass `m` starts from the lower plate of two metallic plates separated by a distance `d`. If the potential difference between the plates is `V`, the time taken by the electron to reach the upper plate is given by .A. `sqrt((2 m d^2)/(e V))`B. `sqrt(( m d^2)/(e V))`C. `sqrt(( m d^2)/(2 e V))`D. `(2 m d^2)/( e V)`
Answer» Correct Answer - a `E = V/d, F = eE = e V// d` `a = (F)/(m) = (e V)/(m d)` `d = (1)/(2) at^2` or `t = sqrt((2d)/A)` or `t = sqrt((2 d m d)/(e V)) = sqrt((2 md^2)/(e V))`.

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