Electronic Principles
At room temperature an intrinsic semiconductor has

many free electrons
a few free electrons and holes
None of these
No holes
many holes

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

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Electronic Principles
For a pure capacitor:

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

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