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QPage 229: Q8: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Page 229: Q8 Solution: A charged particle moves in a uniform magnetic field. The…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the magnetic force changes the particle's speed, so they expect the axial component of velocity to vary and the helix pitch to be non‑uniform. Remember that the magnetic force is always perpendicular to velocity, does no work, and leaves the parallel component of velocity unchanged, yielding a helix of constant (uniform) pitch.

A charged particle moves in a uniform magnetic field. The velocity of the particle at some instant makes an acute angle with the magnetic field. The path of the particle will be

Multiple Choice Options

  • A a straight line
  • B a circle
  • C a helix with uniform pitch
  • D a helix with non-uniform pitch

Step-by-Step Verified Solution

**Answer:** (c) a helix with uniform pitch. **Step-by-Step Explanation:** When velocity makes an acute angle with B, the path is a helix with uniform pitch.

All Questions in this Chapter

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