When a charged particle enters in a strong magnetic field, its kinetic energy _.
Correct answer: D. Remains constant
- A. Decreases
- B. Increases then decreases
- C. Becomes zero
- D. Remains constant
Explanation
When a charged particle enters a strong magnetic field, its kinetic energy remains constant. This is because a magnetic field exerts a force only perpendicular to the velocity of the charged particle. This force, known as the magnetic force, does not do any work on the particle because it is always perpendicular to the direction of motion.The magnetic force causes the charged particle to move in a circular or helical path, depending on its initial velocity and the strength of the magnetic field. While the direction of motion changes due to the magnetic force, the magnitude of the velocity, and hence the kinetic energy, remain constant.So, option D) Remains constant is the correct choice.
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About Charged Particle in a Magnetic Field
A charged particle moving through a magnetic field experiences the Lorentz force, which is perpendicular to both its velocity and the field. The motion may be circular or helical, with questions involving radius, angular frequency, time period, and work done. A stationary charge feels no magnetic force.
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