Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

None of these
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when the core material is saturated
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

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Electronic Principles
Molecule is

None of these
A atom that has a shortage of electrons in its outer orbit
A atom that has an excessive number of electrons in its outer orbit
The smallest particle of a substance that retains the properties of that substance
A atom that flows whenever there is an imbalance of electrical charges between two points

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

The ac voltage lags the current by 90 degree
None of these
Resistances provide the only opposition to current flow
Inductive reactance provides the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow

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