Engineering Materials in EE
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

 magneto-calorisation.
 magnetic hysteresis.
 magnetic expansion.
 magnetostriction.

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Engineering Materials in EE
The Bohr model of the atom

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

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