Electronic Principles
Current and voltage are said to be in phase when:

None of these
they have the same amplitude and frequency
their waveforms are both ac or both dc
their waveforms cross through zero and reach positive and negative peaks at the same time
All of these

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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 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

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