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A particle of charge q and mass m is sub...

A particle of charge q and mass m is subjected to an electric field `E=E_(0)(1-ax^(2))` in the x - direction, where a and `E_(0)` are constants. Initially the particle was at rest at x = 0. Other than the initial position the kinetic energy of the particle becomes zero when the distance of the particle from the origin is :

A

a

B

`sqrt((2)/(a))`

C

`sqrt((3)/(a))`

D

`sqrt((1)/(a))`

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