Verified Solution • 2025–26 Session moderate

QPages 229-230: Q2: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Pages 229-230: Q2 Solution: If a charged particle kept at rest experiences an…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that any magnetic field must produce a force, overlooking that the magnetic force term $q\mathbf{v}\times\mathbf{B}$ vanishes for a particle at rest. Remember: a stationary charge can feel a force only from an electric field, while a magnetic field may still be non‑zero but does not contribute to the force.

If a charged particle kept at rest experiences an electromagnetic force,

Multiple Choice Options

  • A there must be an electric field
  • B there must be a magnetic field
  • C both fields cannot be zero
  • D both fields can be non-zero

Step-by-Step Verified Solution

**Answer:** (a), (d). **Step-by-Step Explanation:** A charged particle at rest experiences force only from electric field. So there must be an electric field (a). Both fields can be non-zero (d).

All Questions in this Chapter

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