Question

An electron falls through a small distance in a uniform electric field of magnitude `2xx10^(4)NC^(-1)`. The direction of the field reversed keeping the magnitude unchanged and a proton falls through the same distance. The time of fall will be
A. same in both cases
B. more in the case of electron
C. more in the case of proton
D. independent of charge

Answer 1

Correct Answer - c
The time required to fall through distance `d` is
`d=(1)/(2)((qE)/(m))t^(2)` or `t= sqrt((2dm)/(qE))`