What is the result of a charged particle moving perpendicular to a magnetic field?

When a charged particle moves perpendicular to a magnetic field, it experiences a force due to the magnetic field that alters its trajectory. This force is described by the Lorentz force law, which states that a charged particle moving in a magnetic field will experience a force that is perpendicular to both the velocity of the particle and the direction of the magnetic field.

As a result, instead of moving in a straight line, the charged particle undergoes circular motion or spirals, depending on its initial velocity and the angle with respect to the magnetic field. This change in direction represents an acceleration, although the particle's speed remains constant while it moves in this perpendicular path. Hence, the correct answer reflects the fundamental behavior of charged particles in magnetic fields, emphasizing the continuous change in direction due to the forces acting upon them.