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

None of these
Valence electrons
Doping
Free electrons
Thermal energy

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Electronic Principles
For a pure capacitor:

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

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