medium · MCAT chem-phys

A proton moves with a velocity of 1.0 × 10^6 m/s perpendicular to a uniform magnetic field.

What happens to the proton's speed?

  1. The speed decreases due to the opposing magnetic force.
  2. The speed increases as the magnetic field adds kinetic energy.
  3. The speed changes only if the proton is moving parallel to the field.
  4. The speed remains constant because the magnetic field does zero work.

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