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

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

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

None of these
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
doubles the amount of current through the inductors
cuts the current through the inductors one-half
has no effect on the current through the inductors

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