A charged particle with charge q enters a region of constant uniform and mutually perpendicular fields E and B with a velocity v

Question

A charged particle with charge q enters a region of constant uniform and mutually perpendicular fields E and B with a velocity v perpendicular to both E and B and comes out without any change in magnitude or direction of v Then 1 v Ex B B 2 v Bx E B 3 V ExB E 4 v Bx E E

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