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:
Text Solution
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Ferromagnetic subsiances have strong tendency to get magnetised (induced magnetic moment) in the same direction as that of applied magnetic field, so magnet attracts 
strongly. Paramagnetic substances get weakly magnetised (magnetic moment induced is small) in the same direction as that of applied magnetic field, so magnet attracts 
weakly.
Diamagnetic substances also get weakly magnetised when placed in an external magnetic field but in opposite direction and hence, 
is weakly repelled by magnet.
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