Motion of charged particle in magnetic field – Rankers Physics

Force Acting on Moving Charges: Practice Problem & Solution

A charged particle moves in a circular path under the action of uniform transverse magnetic field. Which of the given statement should be correct based on above information?
Both momentum and kinetic energy of the particle remain constant
Both momentum and kinetic energy of the particle does not remain constant.
Kinetic energy changes but the momentum remains constant.
Momentum changes but the kinetic energy remains constant.

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:

In a uniform magnetic field, the magnetic force is always perpendicular to velocity. Hence, work done is zero and kinetic energy remains constant. However, direction of velocity changes continuously, so momentum changes.

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