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Q.

There are four light-weight-rod samples A, B, C and D separately suspended by threads. A bar magnet is slowly brought nearer to each sample and the following observations are noted. 
(i) A is feebly repelled
(ii) B is feebly attracted 
(iii) C is strongly attracted
(iv) D remains unaffected
Which one of the following is true?

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a

A is of a non-magnetic material

b

B is of a paramagnetic material

c

D is of a ferromagnetic material

d

C is of a diamagnetic material 

answer is D.

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Detailed Solution

Feebly repelled  dia 
Feebly attracted   para
Strongly attracted  Ferro 
Unaffected  Non –magnetic
 

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