In the figure shown a charge q moving w...

In the figure shown a charge `q` moving with a velocity v along the x-axis enter into a region of uniform magnetic field. The minimum value `v` so that the charge `q` is able to enter the region `xgtb`

`q bB//m`

`q(b-a)B//m`

`qaB//m`

`q(b+a)B//2m`

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