A) Attract\[{{N}_{1}}\]and\[{{N}_{2}}\]strongly but repel\[{{N}_{3}}\]
B) Attract\[{{N}_{1}}\]strongly, \[{{N}_{2}}\]weakly and repel\[{{N}_{3}}\] weakly
C) Attract\[{{N}_{1}}\]strongly, but repel\[{{N}_{2}}\]and\[{{N}_{3}}\]weakly
D) attract all three of them
Correct Answer: B
Solution :
Ferromagnetic substances have strong tendency to get magnetized (induced magnetic moment) in the same direction as that of applied magnetic field, so magnet attracts\[{{N}_{1}}\] strongly. Paramagnetic substances get weakly magnetized (magnetic moment induced is small) in the same direction as that of applied magnetic field, so magnet attracts\[{{N}_{2}}\]weakly. Diamagnetic substances also get weakly magnetized when placed in an external magnetic field but in opposite direction and hence\[{{N}_{3}}\]is weakly repelled by magnet.
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