Verified Solution • 2025–26 Session moderate

QPages 229-230: Q4: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Pages 229-230: Q4 Solution: A charged particle moves in a gravity-free space without change …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently assume that any non‑zero electric or magnetic field must change a charge’s speed, overlooking that the Lorentz force $q(\mathbf E+\mathbf v\times\mathbf B)$ can be zero if $\mathbf E$ and $\mathbf v\times\mathbf B$ cancel or if $\mathbf v\parallel\mathbf B$; always verify the vector condition $\mathbf E=-\mathbf v\times\mathbf B$ before declaring a configuration possible.

A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible?

Multiple Choice Options

  • A E=0,B=0E = 0, B = 0
  • B E=0,B≠0E = 0, B \neq 0
  • C E≠0,B=0E \neq 0, B = 0
  • D E≠0,B≠0E \neq 0, B \neq 0

Step-by-Step Verified Solution

**Answer:** a), b), c), d). **Step-by-Step Explanation:** A charged particle can move without change in velocity if E = 0, B = 0 (a), or if the forces balance (b, c, d).

All Questions in this Chapter

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