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

Options

A. `vecv = (vecE xx vecB) // B^2`
B. `vecv = (vecB xx vecE)// B^2`
C. `vecv = (vecE xx vecB)//E^2`
D. ``vecv = (vecB xx vecE) //E^2`

Answer

A