A beam of electrons is shot through a region of space with no magnetic field. Suddenly, a magnetic field perpendicular to the electron beam is turned on. The path of the electrons will: A beam of electrons is shot through a region of space with no magnetic field. Suddenly, a magnetic field perpendicular to the electron beam is turned on. The path of the electrons will: Curve, forming a circular path due to the magnetic force. Spread out in all directions. Instantly reverse direction. Continue straight, unaffected by the magnetic field