A charged particle moving parallel to a magnetic field experiences a force of
Correct answer: B. zero
- A. maximum magnitude
- B. zero
- C. half the maximum
- D. qvB
Explanation
The magnetic force is qvB sin theta, and sin 0 is zero, so a charge travelling along the field lines feels nothing at all. The force is maximum when the motion is perpendicular to the field, and it is then qvB. This angular dependence is why charged particles from the Sun spiral in along the Earth's field lines near the poles and produce aurorae.
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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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