A charged particle travels undeflected through a region containing an electric and a magnetic field. It is possible that

Step-by-step solution

The Lorentz force on a charged particle is given by F = q( E + v B ) . For the particle to travel undeflected, the net force must either be zero or parallel to its velocity v . If F = 0 , then E = -( v B ) . This implies E is perpendicular to B . Thus, E is not parallel to B , making option (1) possible. If E B and v E , then v B , which gives v B = 0 . The net force is F = q E . Since E v , the force is parallel to the velocity. The particle accelerates or decelerates along a straight line without deflection, maki