A charged particle moves in a magnetic field. What is the effect of the magnetic

Practice Questions

Q1
A charged particle moves in a magnetic field. What is the effect of the magnetic field on the particle's speed?
  1. Increases speed
  2. Decreases speed
  3. No effect on speed
  4. Reverses speed

Questions & Step-by-Step Solutions

A charged particle moves in a magnetic field. What is the effect of the magnetic field on the particle's speed?
  • Step 1: Understand that a charged particle is a particle with an electric charge, like an electron or proton.
  • Step 2: Recognize that a magnetic field is an area around a magnet where magnetic forces can be felt.
  • Step 3: Know that when a charged particle moves through a magnetic field, it experiences a force.
  • Step 4: This force is always perpendicular (at a right angle) to the direction the particle is moving.
  • Step 5: Since the force is perpendicular, it does not speed up or slow down the particle; it only changes the direction of the particle's movement.
  • Step 6: Therefore, the speed of the charged particle remains constant while its direction changes.
  • Magnetic Force on Charged Particles – The magnetic field exerts a force on a charged particle that is perpendicular to its velocity, resulting in a change in direction but not speed.
  • Lorentz Force – The force experienced by a charged particle in a magnetic field is described by the Lorentz force law, which states that the force is perpendicular to both the velocity of the particle and the magnetic field.
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