Electronic Principles
Voltage is

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

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Electronic Principles
In a pure inductor:

ac current and voltage are exactly in phase
None of these
ac current is converted to dc voltage
ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree

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