175. Two metals A and B are placed in a magnetic field. The volume of the magnetic domains of metal A changes with difficulty, and after removing the external field it returns to its initial state; but the volume of the domains in metal B changes with ease, and after removing the external field it returns to its initial state. A and B are respectively:
- [(1)] Paramagnetic and hard ferromagnetic
- [(2)] Soft ferromagnetic and paramagnetic
- [(3)] Hard ferromagnetic and soft ferromagnetic
- [(4)] Soft ferromagnetic and hard ferromagnetic
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Physics 120-C Page 14