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Question 20162
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Magnetism: Lorentz Force — No Work MCQ

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Lorentz Force — No WorkEasyQuestion 20162

Question

Magnetic force does no work on a moving charge because it is always:
  1. A
    Parallel to velocity
  2. B
    Perpendicular to velocity
    Correct
  3. C
    Zero
  4. D
    Along the field

Correct answer

Perpendicular to velocity

Explanation

Power = F·v = 0 when F ⊥ v, so the magnetic force never changes the kinetic energy of a charge.

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