Electronic Principles
The peak value of a sine waveform is:

the amplitude at 70.7% of the maximum value
the maximum positive or negative value
the amplitude at 1.41 times the maximum value
the amplitude at 90% of the maximum value
None of these

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Electronic Principles
For a pure capacitor:

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

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