Match List - I with List - II.
| List-I | List-II |
| (A) Negative susceptibility | (I) Ferromagnetic material |
| (B) Weak attraction to magnet | (II) Paramagnetic material |
| (C) Hysteresis loop | (III) Diamagnetic material |
| (D) \( \mu \gg \mu_0 \) | (IV) Retentivity |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
Materials are grouped by their magnetic susceptibility \( \chi \), defined by \( M = \chi H \), and by their permeability \( \mu = \mu_0(1 + \chi) \).
(A) Negative susceptibility — this matches (III) Diamagnetic material. In a diamagnetic material the induced magnetisation is opposite to the applied field, so \( \chi \) is small and negative and \( \mu \) is a little less than \( \mu_0 \).
(B) Weak attraction to magnet — this matches (II) Paramagnetic material. A paramagnetic substance has a small positive \( \chi \), so it is weakly attracted towards the stronger part of a magnetic field.
(C) Hysteresis loop — this matches (IV) Retentivity. On the hysteresis loop of a ferromagnet, the field \( B \) left when \( H \) is brought back to zero is the retentivity (remanence).
(D) \( \mu \gg \mu_0 \) — this matches (I) Ferromagnetic material. Ferromagnets such as iron have a very large positive \( \chi \) (of the order of \( 10^{3} \)), so their permeability is many times \( \mu_0 \).
Note: Items (A), (B) and (D) of this question are from the latest textbook (2026-27). Item (C), that a hysteresis loop shows retentivity, is printed only in the pre-rationalised textbook (2022-23). It was removed from the latest book, and it also appears to be out of the CUET 2026 syllabus.
NCERT (2026-27):
Summary – “… 7. Magnetic materials are broadly classified as: diamagnetic, paramagnetic, and ferromagnetic. For diamagnetic materials \( \chi \) is negative and small and for paramagnetic materials it is positive and small. Ferromagnetic materials have large \( \chi \).”
Paramagnetism – “Paramagnetic substances are those which get weakly magnetised when placed in an external magnetic field. They have tendency to move from a region of weak magnetic field to strong magnetic field, i.e., they get weakly attracted to a magnet.”
NCERT (Pre-rationalised edition, 2022-23):
Ferromagnetism – “… The value of B at H = 0 is called retentivity or remanence.”
Ferromagnetism – “… For a given value of H, B is not unique but depends on previous history of the sample. This phenomenon is called hysterisis.”