Easy
Needles $N_{1}$,$N_{2}$,and $N_{3}$ are made of a ferromagnetic,a paramagnetic,and a diamagnetic substance,respectively. $A$ magnet when brought close to them will
- AAttract all three of them
- BAttract $N_{1}$ strongly,$N_{2}$ weakly,and repel $N_{3}$ weakly
- CAttract $N_{1}$ strongly but repel $N_{2}$ and $N_{3}$ weakly
- DAttract $N_{1}$ and $N_{2}$ strongly but repel $N_{3}$
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