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A proton moves in the –x-direction and encounters a uniform magnetic field pointing in the +x-direction. In what direction is the resulting magnetic force on the proton?
  1. The proton experiences no magnetic force.
  2. +x-direction
  3. −y-direction
  4. +y-direction
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OpenStax College Physics for AP® Courses Solution, Chapter 22, Problem 7 (Test Prep for AP® Courses) (0:19)

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This is College Physics Answers with Shaun Dychko. Because this proton's velocity is parallel to the magnetic field or anti-parallel if you want to be precise because they're going in opposite directions, there is no magnetic force at all on this moving charge.