Statements on Magnetic Force – Rankers Physics

Force Acting on Moving Charges: Practice Problem & Solution

Consider the following statements: A. Magnetic force on a moving charged particle is always non-zero. B. Magnetic force can change kinetic energy of a charged particle. C. Magnetic force can change linear momentum of a charged particle. D. A charged particle at rest does not feel magnetic force on it. The correct statement(s) is/are
Only C
A, B and C
C and D
B, C and D

Solution Explained:

To solve this problem, we apply the core principles of Force Acting on Moving Charges. Understanding the underlying formula is key to arriving at the correct answer below:

Magnetic force is perpendicular to velocity, so it does no work and KE remains constant. It can change the direction of velocity (and thus momentum). For a particle at rest (\(v = 0\)), magnetic force is zero.

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