A magnetic field___________________?
Correct answer: D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
- A. always exerts a force on a charged particle
- B. never exerts a force on a charged particles
- C. exerts a force if the charged particle is moving in the direction of the magnetic field lines
- D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Explanation
The magnetic force is F = qvB sin θ, so it is greatest when a charged particle moves perpendicular to the magnetic field lines. Students may choose a because they overlook that a stationary or neutral particle experiences no magnetic force, and motion parallel to the field also gives zero force.
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About Charged Particle in a Magnetic Field
A charged particle moving through a magnetic field experiences the Lorentz force, which is perpendicular to both its velocity and the field. The motion may be circular or helical, with questions involving radius, angular frequency, time period, and work done. A stationary charge feels no magnetic force.
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