Question

There are four light-weight-rod samples $A,B,C,D$ separately suspended by threads. $A$ bar magnet is slowly brought near 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?

• A. B is of a paramagnetic material
• B. C is of a diamagnetic material
• C. D is of a ferromagnetic material
• D. A is of a non-magnetic material

Answer 1

Answer: (A)

Diamagnetic will be feebly repelled.
Paramagnetic will be feebly attracted.
Ferromagnetic will be strongly attracted
Therefore, $A$ is of diamagnetic material.
$B$ is of paramagnetic material.
$C$ is of ferromagnetic material.
$D$ is of non-magnetic material.