Q.

Needles N1, N2, N3 are made of a ferromagnetic, paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

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a

attract N1 strongly, but repel N2, N3 weakly

b

attract N1 and N2 strongly but repel N3

c

attract all three of them

d

attract N1 strongly, N2 weakly and repel N3 weakly

answer is C.

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Detailed Solution

Ferromagnetic substance magnetizes strongly in the direction of magnetic field.

Paramagnetic substance magnetizes weakly in the direction of magnetic field. 

Diamagnetic substance magnetizes weakly in the opposite direction of magnetic field.

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