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An electron of mass 9.11031kg and charge 1.61019C is situated in a uniform electric field of intensity 1.2104Vm1. Find the time it takes to travel 1cm from rest.

Given,

Mass of electron (me)=9.11031kg
Charge of electron (e)=1.61019
Electric field intensity (E)=1.2104V/m
Distance covered (s)=1cm=1002m
Time taken (t) = ?

We have,
F=eE
or, ma = eE
or, a=eEm=1.610191.21049.11031=2.11015m/s2
Now we have to calculate,
S=ut+12at2
S=0+12at2                                              [∵ u=0m/s]

0.01=122.11015t2
t=3.1109Sec

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