Electronic Principles
Voltage is

The number of free electrons in an atom
The flow of charged particles through a material
None of these
The smallest electrically charged particle
Trie force that causes electrons to flow

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

The concentration of lines of magnetic force
None of these
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

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Electronic Principles
A low-pass filter:

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

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