Engineering Materials in EE
The permeability of iron can be increased by

 increasing carbon percentage.
 purifying it.
 alloying with cobalt.
 reducing carbon percentage.

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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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