Electronic Principles
Doubling the operating frequency of an inductive circuit:

cuts the inductive reactance in half
multiplies the inductive reactance by 6.28
has no effect on the inductive reactance
None of these
doubles the amount of inductive reactance

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

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

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