Verified Solution • 2025–26 Session moderate

QPage 229: Q4: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Page 229: Q4 Solution: Which of the following particles will describe the smallest…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume that the particle with the highest charge magnitude will have the smallest radius, ignoring the mass dependence. You must evaluate the ratio $m/q$ for each particle, recognizing that the electron's extremely small mass dominates over its unit charge to produce the minimum radius.

Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a magnetic field?

Multiple Choice Options

  • A Electron
  • B Proton
  • C He+
  • D Li+

Step-by-Step Verified Solution

**Answer:** (a) Electron. **Step-by-Step Explanation:** r = mv/(qB). Electron has the smallest mass, so the smallest radius.

All Questions in this Chapter

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