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A particle of charge 1 mu C & mass 1 m...

A particle of charge ` 1 mu C & ` mass `1 mg` moving with a velocity of ` 4 m//s` is subjected to a uniform electric field of magnitude ` 300 V m` for ` 10 sec`. Then it's final speed cannot be :

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The correct Answer is:
A
Velocity due to acceleration
`=(10^(-6)xx300)/10^(-3)xx10=3 m//s`
Then the resultant velocity may be between `1 m//s` and `7 m//s`
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ALLEN -MISCELLANEOUS-Exercise-02
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