A charged particle moves with velocity through a region having a uniform magnetic field . Under which condition is the magnetic Lorentz force acting on the particle strictly zero?
Answer and explanation
Correct answer: C. When is parallel or antiparallel to
- Step 1: The magnetic Lorentz force on a moving charge is , whose magnitude is .
- Step 2: For or (parallel or antiparallel), , giving .
Answer
When is parallel or antiparallel to .
Why not the others: Perpendicular motion maximizes force (); angles of and yield non-zero transverse magnetic forces.
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