alleryStart learning →A charge moving parallel to a magnetic field experiences a magnetic force that is:
ATwice as big
BAlways upward
CExactly zero
DAt a maximum
Answer & Solution
Correct answer: C. Exactly zero
1. The angle between velocity and field controls the force.
2. The magnitude of the magnetic force depends on the charge, speed and field strength.
3. It also depends on the angle between the direction of motion and the field.
4. Parallel motion means that angle is zero.
5. The force is therefore zero for motion along the field.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 22 'Magnetism', sections 22.1-22.11_
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