Electronic Principles
Which one of the following phrases best describes residual magnetism?

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

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Electronic Principles
For a pure capacitor:

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

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Electronic Principles
What is a free electron?

An electron that has been freed from its parent atom
None of these
An electron that has twice the amount of charge of a normal electron
An electron that has no electrical charge
An electron that costs nothing

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