O Levels Physics (5054)•5054/12/M/J/21
Explanation
Magnetic Induction in Ferromagnetic Materials
Steps:
- North pole of compass attracts end X, so end X acts as South pole.
- Compass field induces temporary magnetism in nearby ferromagnetic material.
- Steel is ferromagnetic and responds to induction if unmagnetized.
- Copper lacks ferromagnetic properties, preventing induction.
Why C is correct:
- Steel, when unmagnetized, undergoes magnetic induction per the law of magnetic poles (opposites attract), creating a temporary South pole at X that draws the compass North pole.
Why the others are wrong:
- A: Copper is diamagnetic and cannot be induced to form poles for attraction.
- B: Permanent South pole at X would attract, but question implies induction in unmagnetized rod, not pre-existing magnetization.
- D: North pole at X repels compass North pole, violating attraction observed.
Final answer: C
Topic: Simple magnetism and magnetic fields
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