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 `vec E = E_0 hat i and vec B = B_0 hat i` with a velocity `vec v = v_0 hat j`. The speed of the particle will become `2v_0` after a time.

`(sqrt2m upsilon_(0))/(qE_(0))`

`(2m upsilon_(0))/(qE_(0))`

`(3m upsilon_(0))/(qE_(0))`

`(sqrt3m upsilon_(0))/(qE_(0))`

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