Electronic Principles
Which one of the following phrasers best describes flux density?

The concentration of lines of magnetic force
The opposition to a build-up of magnetic fields
The rate of change of the number of lines of magnetic force
The force that maintains lines of force
None of these

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Electronic Principles
A low-pass filter:

reduces the level of all frequencies by a significant amount
None of these
passes higher-frequency signals and reduces lower-frequency signals
passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals

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

Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
None of these
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
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

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

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

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