A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields `vecE` and `vecB` with a velocity `vecv` perpendicular to both `vecE` and `vecB`, and comes out without any change in magnitude or direction of `vecv`. Then

Options

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

Answer

C