A charged particle with charge q enters a region of constant, uniform and mutually orthogonal field `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

Options

A. `vec(v) = vec(B) xx vec(E )//E^(2)`
B. `vec(v)= vec(E ) xx vec(B)//B^(2)`
C. `vec(v)= vec(B)xx vec(E )//B^(2)`
D. `vec(v)= vec(E )xx vec(B)//E^(2)`

Answer

B