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The electric field acts positive x-axis....

The electric field acts positive `x`-axis. A charged particle of charge `q` and mass `m` is released from origin and moves with velocity `vec(v)=v_(0)hatj` under the action of electric field and magnetic field, `vec(B)=B_(0)hati`. The velocity of particle becomes `2v_(0)` after time `(sqrt(3)mv_(0))/(sqrt(2)qE_(0))`. find the electric field:

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