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A particle of charge q and mass m starts...

A particle of charge q and mass m starts moving from the origin under the action of an electric field `vecE=E_0 hat i` and `vec B=B_0 hat i` with velocity `vec v=v_0 hat j`. The speed of the particle will become `2v_0` after a time

A

`t=(2mv_0)/(qE)`

B

`t=(2Bq)/(mv_0)`

C

`t=(sqrt3Bq)/(mv_0)`

D

`t=(sqrt3mv_0)/(qE)`

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