Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a positive charge and a proton has a negative charge
An electron has a positive charge and a proton has no charge
An electron has a negative charge and a proton has no charge
An electron has a negative charge and a proton has a positive charge
None of these

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Electronic Principles
For a pure capacitor:

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

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