Engineering Materials in EE
Positive magnetostriction exists when

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

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Engineering Materials in EE
The Bohr model of the atom

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

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