alleryYou slide an iron rod into the two coils along their axis. The deflection:
AIncreases sharply
BDrops to zero
CStays the same
DChanges colour
Answer & Solution
Correct answer: A. Increases sharply
1. Iron strengthens the magnetic field inside the coils.
2. More field means more flux change.
3. The deflection increases dramatically.
_Source: syllabus Physics Part I, Chapter 6, Electromagnetic Induction._
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