A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines.Ignoring the particle's weight,the particle will
A)move in a straight line.
B)follow a spiral path.
C)move along a parabolic path.
D)follow a circular path.

Question

Quizplus · Accepted Answer

When a charged particle is injected into a uniform magnetic field with a velocity vector perpendicular to the magnetic field lines, it experiences a Lorentz force that is always perpendicular to both its velocity vector and the magnetic field lines. This force causes the particle to move in a circular path with a radius given by: 
r = mv/qB 
where m is the mass of the particle, v is its velocity magnitude, q is its charge, and B is the magnetic field strength. Since the particle's weight is negligible in this case, it will continue to move in this circular path indefinitely. Therefore, the particle's motion will be a circular path.

A Charged Particle Is Injected into a Uniform Magnetic Field