(A) always exerts a force on a charged particle (X)
(B) never exerts a force on a charged particles (X)
(C) exerts a force if the charged particle is moving in the direction of the magnetic field lines (X)
(D) exerts a force if the charged particle is moving perpendicular to the magnetic field lines (
)
Answers: A magnetic field exerts a force if the charged particle is moving perpendicular to the magnetic field lines.
