Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity and at a steady level
None of these
The voltage remains at one polarity but changes value periodically
The voltage causes current to flow in two directions at the same time
The voltage reverses polarity periodically

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Electronic Principles
What is a negative ion?

An atom that contains more protons than electrons
An atom that contains more electrons than neutrons
An atom that contains more electrons than protons
An atom that contains more protons than neutrons
None of these

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