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A particle of charge q and mass m is subjected to an electric field E = E₀ (1 – ax²) in the x-direction, where a and E₀ 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:

1)
a
2) a
3) V!
a
4)
a

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