Electronic Principles
For a pure capacitor:

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

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Electronic Principles
What is a free electron?

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

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