Electronic Principles
Doubling the operating frequency of a capacitive circuit:

multiplies the capacitive reactance by 6.28
None of these
cuts the capacitive reactance in half
doubles the amount of a capacitive reactance
has no effect on the capacitive reactance

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Electronic Principles
The peak value of a sine waveform is:

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

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