Verified Solution • 2025–26 Session moderate

QPage 229: Q2: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Page 229: Q2 Solution: A charged particle is whirled in a horizontal circle on a…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the magnetic force always opposes or aids the centripetal requirement without checking the cross product $\vec{F} = q(\vec{v} \times \vec{B})$. Since the force direction depends on the sign of the charge and the sense of rotation, it can either add to or subtract from the tension, making the net tension variable.

A charged particle is whirled in a horizontal circle on a frictionless table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string

Multiple Choice Options

  • A will increase
  • B will decrease
  • C will remain the same
  • D may increase or decrease

Step-by-Step Verified Solution

**Answer:** (d) may increase or decrease. **Step-by-Step Explanation:** The magnetic force on the charged particle can add to or subtract from the tension depending on the direction of motion.

All Questions in this Chapter

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