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

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

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

None of these
has no effect on the current through the inductors
doubles the amount of current through the inductors
cuts the current through the inductors one-half
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

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