O-LevelPhysicsMagnetism5054/12 · May/June 2014 · Q301 Mark
What always produces a permanent bar magnet?
Aan iron bar in a coil carrying alternating current (a.c.)
Ban iron bar in a coil carrying direct current (d.c.)
Csteel bar in a coil carrying alternating current (a.c.)
Dsteel bar in a coil carrying direct current (d.c.)
✓ Correct answer
D: steel bar in a coil carrying direct current (d.c.)
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