A charged particle with charge g enters a region of constant, uniform and mutually orthogonal 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

• A

  v = E x B/E²

• B

  v = B x E/E²

• C

  v = E x B/B²

• D

  v = B x E/B²