Electronic Principles
For a pure capacitor:

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
ac current leads the voltage by 90 degree

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Electronic Principles
What is a free electron?

None of these
An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
An electron that has been freed from its parent atom
An electron that costs nothing

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