Needles ${N_1}$, ${N_2}$ and ${N_3}$ are made of ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will
attract ${N_1}$ and ${N_2}$ strongly but repel ${N_3}$
attract ${N_1}$ strongly, ${N_2}$ weakly and repel ${N_3}$ weakly
attract ${N_1}$ strongly, but repel ${N_2}$ and ${N_3}$ weakly
attract all three of them
Solution
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