Engineering Materials in EE
Positive magnetostriction exists when

 both are correct.
 dipoles are attract each other.
 dipoles are repel other.
 none of above.

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Engineering Materials in EE
The Bohr model of the atom

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

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