O Levels Physics (5054)•5054/12/M/J/19
Explanation
Magnetic interactions distinguish material types Steps:
- End X of bar 1 attracts to N-pole of magnet, showing bar 1 is ferromagnetic and induced by the field.
- End Y of bar 2 repels S-pole of magnet, indicating bar 2 is a permanent magnet with fixed S-pole at end Y (like poles repel).
- Copper is non-magnetic, showing no attraction or repulsion.
- Iron is soft ferromagnetic (attracted to poles, no fixed polarity); steel is hard ferromagnetic (retains magnetism, can repel like poles).
Why B is correct:
- Iron (bar 1) attracts due to temporary magnetization (soft iron property); steel (bar 2) repels like pole per magnetic pole repulsion law.
Why the others are wrong:
- A: Copper (bar 1) shows no attraction to N-pole.
- C: Copper (bar 2) shows no repulsion from S-pole.
- D: Iron (bar 2) attracts to S-pole, does not repel.
Final answer: B
Topic: Simple magnetism and magnetic fields
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