A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move
in a circular orbit
along a Parabolic Path
along a straight line
in an elliptical orbit.
If the electric field is switched off, and the same 2 magnetic field is maintained, the electrons move in a circula orbit and electron will travel a magnetic field Perpendicular to its velocity.