Verified Solution • 2025–26 Session moderate

QPages 303-304: Q10: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Induction Pages 303-304: Q10 Solution: A metallic bob A oscillates through the space between the poles …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think that turning the circuit on strengthens the magnetic field and thus increases damping, but the field is fixed from the electromagnet. The real mechanism is that the moving conductor (bob) induces eddy currents in its own body; when the circuit is closed these currents can flow and dissipate energy as heat, so the damping comes from eddy currents, not from a change in the external field.

A metallic bob A oscillates through the space between the poles of an electromagnet See the figure). The oscillations are more quickly damped when the circuit is on, as compared to the case when the circuit is off. Explain.

Step-by-Step Verified Solution

**Answer:** Eddy currents damp the oscillations when the circuit is on. **Step-by-Step Explanation:** When the circuit is on, the bob oscillates through a magnetic field, inducing eddy currents. These currents dissipate energy as heat, reducing the kinetic energy of the bob. Hence, the oscillations damp faster when the circuit is on [citation:1].

All Questions in this Chapter

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