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True or false: the magnetic force can change the speed of a charged particle.

  • A.True, the force being proportional to the speed
  • B.True, whenever the particle moves along the field direction
  • C.True, if the field is strong enough to overcome the inertia
  • D.False, the force acting at right angles to the velocity at every instant

Answer: D

The force is always perpendicular to the velocity, so it contributes nothing to the work integral and the kinetic energy is constant. Only the electric part of the Lorentz force, or a changing magnetic field through the induced electric field, can alter a particle's energy.

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