Asked in FBISE Physics 2022 — Paper 2 2022

Work done on a charged particle moving in a uniform magnetic field is:

Correct answer: C. Zero

  • A. Minimum
  • B. Maximum
  • C. Zero
  • D. Negative

Explanation

The work done on a charged particle moving in a uniform magnetic field is zero. This is because the magnetic force is always perpendicular to the direction of motion of the particle, and since work is the dot product of force and displacement, no work is done by the magnetic field on the particle

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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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