Verified Solution • 2025–26 Session moderate

QPages 229-230: Q6: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Pages 229-230: Q6 Solution: A charged particle goes undeflected in a region containing an…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that for a particle to be undeflected, the electric and magnetic fields must be parallel or the velocity must be parallel to both. However, if $\vec{v} \parallel \vec{B}$, the magnetic force is zero ($\vec{F}_B = q\vec{v} \times \vec{B} = 0$), so the particle remains undeflected as long as the electric force is also zero or balanced, regardless of the angle between $\vec{E}$ and $\vec{B}$.

A charged particle goes undeflected in a region containing an electric and a magnetic field. It is possible that

Multiple Choice Options

  • A E⃗∥B⃗,v⃗∥E⃗\vec{E} \parallel \vec{B}, \vec{v} \parallel \vec{E}
  • B E⃗\vec{E} is not parallel to B⃗\vec{B}
  • C v⃗∥B⃗\vec{v} \parallel \vec{B} but v⃗\vec{v} is not parallel to E⃗\vec{E}
  • D E⃗∥B⃗\vec{E} \parallel \vec{B} but v⃗\vec{v} is not parallel to E⃗\vec{E}

Step-by-Step Verified Solution

**Answer:** (a), (b), (c). **Step-by-Step Explanation:** A charged particle can go undeflected if E _ B and v _ E (a), or if E is not parallel to B (b) in certain configurations, or if v _ B but not parallel to E (c).

All Questions in this Chapter

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