Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Thermal energy
Free electrons
Doping
Valence electrons
None of these

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

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

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