Engineering Materials in EE
In ferromagnetic materials

 the constituent is only iron.
 the atomic magnetic moments are parallel.
 one of the constituent is iron.
 the atomic magnetic moments are antiparallel and unequal.

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Engineering Materials in EE
Which statement is not true of ferromagnetic materials.

 Energy loss is proportional to the area of hysteresis loop.
  They have fixed value of μr.
 They have large magnetic susceptibility.
 They lose their nonlinearly property above the Curie temperature.

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Engineering Materials in EE
The Bohr model of the atom

All of these
 had some made-up rules without explanations.
 could not explain the line spectrum of atoms larger than hydrogen.
 explained the color lines in the hydrogen spectrum.

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