An electron initially at rest, is accele...

An electron initially at rest, is accelerated through a potential difference of `200` volt, so that it acquires a velocity `8.4 xx 10^(6)m//s`. The value of `e//m` of elctron

A

`2.76 xx10^(12)` C/kg

B

`1.76 xx10^(11)` C/kg

C

`0.76 xx10^(12)` C/kg

D

None of these

Verified by Experts

The correct Answer is:

B

Law of conservation of energy
`1/2 mv^2 = eV`
`implies e/m = v^2/(2V) = ((8.4 xx10^6)^2)/(2 xx200) = 1.76 xx10^(11) C//kg`

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