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A particle of mass m and positive charge...

A particle of mass m and positive charge q is projected with a speed of `v_0` in y–direction in the presence of electric and magnetic field are in x–direction. Find the instant of time at which the speed of particle becomes double the initial speed.

A

`(sqrt3 m v_0)/(qE)`

B

`(sqrt2 m v_0)/(qE)`

C

`(m v_0)/(qE)`

D

`(sqrt3 m v_0)/(2qE)`

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