Electronic Principles
For a pure capacitor:

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

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Electronic Principles
What is a negative ion?

An atom that contains more protons than electrons
An atom that contains more electrons than protons
An atom that contains more electrons than neutrons
None of these
An atom that contains more protons than neutrons

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