Verified Solution • 2025–26 Session moderate

QPage 229: Q7: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Page 229: Q7 Solution: A beam consisting of protons and electrons moving at the same…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume that because the magnetic force magnitude $F = qvB$ is identical for protons and electrons, their trajectories will be identical. You must recognize that the deflection angle depends on the acceleration $a = F/m$, so the significant difference in mass ($m_p \gg m_e$) causes the lighter electron to deviate much more sharply than the proton.

A beam consisting of protons and electrons moving at the same speed goes through a thin region in which there is a magnetic field perpendicular to the beam. The protons and the electrons

Multiple Choice Options

  • A will go undeviated
  • B will be deviated by the same angle and will not separate
  • C will be deviated by different angles and hence will separate
  • D will be deviated by the same angle but will separate

Step-by-Step Verified Solution

**Answer:** (c) will be deviated by different angles and hence will separate. **Step-by-Step Explanation:** Protons and electrons have different masses, so they experience different accelerations and deviate by different angles.

All Questions in this Chapter

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