Electronic Principles
Current is

The force that causes electrons to flow
An imbalance of electrical charges
None of these
The number of free electrons in an atom
The flow of charged particles through a material

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
The south pole of a magnet is the one:

that would be attracted to the earths north magnetic pole
None of these
that would be repelled by the north pole of another magnet
that has its molecules arranged in a random pattern
that would be attracted to the earth's south magnetic pole

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