Q. 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) A is of a non-magnetic material
B) B is of a paramagnetic material
C) C is of a diamagnetic material
D) D is of a ferromagnetic material
Explanation
[Solution from source] Feeble attraction towards a magnet is the signature of a paramagnetic material. Feeble repulsion indicates diamagnetic (so the first sample is diamagnetic, not non-magnetic), strong attraction indicates ferromagnetic, and the unaffected sample is non-magnetic, not ferromagnetic. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.