The discovery that a current-carrying conductor produces a magnetic field raises the question of whether the reverse is also possible — can a moving magnet produce an electric effect? Based on your study of this chapter, is this reverse effect real? Name the phenomenon and briefly describe one situation in which it occurs.
Generated by claude-sonnet-4-6 · 2026-06-26 01:10 · grounding rag
Model Answer
Yes, the reverse effect is real. The phenomenon is called electromagnetic induction.
Situation: When a coil of wire is connected to a galvanometer and a bar magnet is moved towards or away from the coil, the galvanometer shows a deflection, indicating that an electric current is induced in the coil. This current exists only as long as the magnet is in motion. Thus, a moving (changing) magnetic field produces an electric current in a nearby conductor.
Source: Chapter 12 – Magnetic Effects of Electric Current, Introduction
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Explanation
- The question tests whether students can connect the chapter's opening hint ("reverse possibility of an electric effect of moving magnets") to the concept of electromagnetic induction.
- Name the phenomenon clearly — electromagnetic induction — for 1 mark.
- Describe one concrete situation (moving magnet + coil + galvanometer) for the remaining marks.
- Do not write about Fleming's left-hand rule or motors here; those are unrelated to the reverse effect.
- The chapter introduction explicitly raises this reverse question; examiners expect students to recall it.