In the figure shown, a charged particle ...

In the figure shown, a charged particle of mass 2 g and charge `5 mu C` enters a circular region of radius `10 cm`, in which there is a uniform magnetic field of strength 4 T and directed perpendicular to the plane of circular region in the figure. If the particle velocity vector rotates through `90^(@)` angle in passing through this region then its speed is :

0.25 mm/s

4mm/s

1cm/s

1mm/s

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