Needles N₁, N₂ and N₃ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will (a) attract N₁ and N₂ strongly but repel N₃ (b) attract N₁ strongly, N₂ weakly and repel N₃ weakly (c) attract N₁ strongly, but repel N₂ and N₃ weakly (d) attract all three of them

Answer: (b). Ferromagnetic N₁: large positive χ, strongly attracted. Paramagnetic N₂: small positive χ, weakly attracted. Diamagnetic N₃: small negative χ, weakly repelled. So the answer is (b).

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Magnetic Materials & Curie Law

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

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Answer: (b)

Ferromagnetic $N_1$ : large positive $\chi$ , strongly attracted.
Paramagnetic $N_2$ : small positive $\chi$ , weakly attracted.
Diamagnetic $N_3$ : small negative $\chi$ , weakly repelled.
So the answer is (b).

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