Discussion
Match List I with List II.
| List I | List II |
|---|---|
| (a) Diamagnetic | (i) Neodymium |
| (b) Paramagnetic | (ii) Iron |
| (c) Ferromagnetic | (iii) Aluminium |
| (d) Supermagnetic | (iv) Bismuth |
Choose the most appropriate answer from the options given below :
Answer: A
The correct matching is (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).
- Bismuth is the classic diamagnetic material, with a relative permeability slightly below 1: (a)-(iv).
- Aluminium is paramagnetic, slightly above 1: (b)-(iii).
- Iron is ferromagnetic: (c)-(ii).
- That leaves neodymium, whose neodymium-iron-boron alloys make the strongest permanent magnets, for the paper's 'supermagnetic': (d)-(i).
The first three pairs are standard, and only one option has all three. The other options put aluminium with diamagnetism or neodymium with ferromagnetism in place of iron.
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