Needles N_1, N_2 and N_3 are made of a ferrom | vedclass

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(A) Ferromagnetic substances are strongly magnetized in the direction of the external magnetic field,leading to a strong attraction.Paramagnetic subst

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Attract $N_1$ strongly,$N_2$ weakly and repel $N_3$ weakly

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(A) Ferromagnetic substances are strongly magnetized in the direction of the external magnetic field,leading to a strong attraction.Paramagnetic substances are weakly magnetized in the direction of the external magnetic field,leading to a weak attraction.Diamagnetic substances are weakly magnetized in the direction opposite to the external magnetic field,leading to a weak repulsion.Therefore,when a magnet is brought close to these needles,it will attract $N_1$ strongly,attract $N_2$ weakly,and repel $N_3$ weakly.

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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