Electronic Principles
What is a free electron?

None of these
An electron that has no electrical charge
An electron that costs nothing
An electron that has twice the amount of charge of a normal electron
An electron that has been freed from its parent atom

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Electronic Principles
A low-pass filter:

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

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