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A beam of electron enter at right angle ...

A beam of electron enter at right angle to an uniform electric field with a velocitgy `3 x 10^(7) m//s, E=1800 v//m` while travelling through a distance of `10cm` , the beam deflected by `2mm` then specific charge of electron is

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`t=x/u=0.1/(3xx10^(7))=1/3xx10^(-8)s,`
`y=(1)/(2)at^(2) a=E (q)/(m)`
` 2xx10^(-3) =1/2(1800q/m).(1/3xx10^(-8)), q/m=2xx10^(11) C//kg`
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