Verified Solution • 2025–26 Session moderate

QPages 303-304: Q3: HC Verma: Concepts of Physics - Volume 2 Electromagnetic Induction Pages 303-304: Q3 Solution: The coil of a moving-coil galvanometer keeps on oscillating for …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think that short‑circuiting the galvanometer coil removes the induced emf and therefore stops the motion, when in fact closing the circuit lets the induced emf drive a current that creates a magnetic torque opposite to the coil’s motion (Lenz’s law), providing rapid electromagnetic damping. Remember: an open coil has only mechanical friction damping, whereas a closed coil experiences strong electromagnetic damping.

The coil of a moving-coil galvanometer keeps on oscillating for a long time if it is deflected and released. If the ends of the coil are connected together, the oscillation stops at once. Explain.

Step-by-Step Verified Solution

**Answer:** Connecting the ends stops the oscillation because electromagnetic damping is introduced. **Step-by-Step Explanation:** When the ends of the coil are open, the only damping is mechanical. When the ends are connected together, the motion of the coil in the magnetic field induces a current in the closed circuit. This induced current produces a magnetic force that opposes the motion (Lenz's law), damping the oscillations rapidly.

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