26. Because the magnetic force depends on velocity but the electric force doesn’t, it’s possible to use perpendicular electric and magnetic fields to select charged particles with a particular velocity. A such velocity selector uses a 20-mT magnetic field perpendicular to a 2-kN/C electric field. At what speed will charged particles pass through the selector undeflected?
(A) 20 km/s
(B) 40 km/s
(C) 80 km/s
(D) 100 km/s
(E) 200 km/s