iran-konkur 2018 Q175

iran-konkur · Other · konkur-riazi_1397_specialized Not Maths
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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\textbf{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:

\begin{itemize}
    \item[(1)] Paramagnetic and hard ferromagnetic
    \item[(2)] Soft ferromagnetic and paramagnetic
    \item[(3)] Hard ferromagnetic and soft ferromagnetic
    \item[(4)] Soft ferromagnetic and hard ferromagnetic
\end{itemize}



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