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Q.

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

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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 is B.

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Detailed Solution

A magnet strongly attracts ferro magnetic material ,weakly attracts para magnetic material and weakly repels dia magnetic material.

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