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A charged particle with charge q enters ...

A charged particle with charge `q` enters a region of constant, uniform and mututally orthogonal fields `vec(E) and vec(B)` with a velocity `vec(v)` perpendicular to both `vec(E) and vec(B)`, and comes out without any change in magnitude or direction of `vec(v)`. Then

A

`vecv=vecExx(vecB)/(B^(2))`

B

`vecv=vecBxx(vecE)/(B^(2))`

C

`vecv=vecExx(vecB)/(E^(2))`

D

`vecv=vecBxx(vecE)/(E^(2))`

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The correct Answer is:
A
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