Electronic Principles
For a pure capacitor:

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

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Electronic Principles
When applying a square waveform to a capacitor, the circuit tends to:

peak both the voltage and current waveforms
round off both the voltage and current waveforms
None of these
peak the current and round off the voltage waveforms
peak the voltage and round off the current waveforms

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