Electronic Principles
In a pure inductor:

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

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Electronic Principles
For a pure capacitor:

ac current lags the voltage by 90 degree
None of these
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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Electronic Principles
Which one of the following phrases best describes residual magnetism?

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
The force of attraction between the poles of a permanent and temporary magnetic field
The circular magnetic field that surrounds a conductor carrying a current

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