Electronic Principles
What is the difference between a conductor and an insulator?

An insulator allows current to flow much easier than a conductor does
A conductor allows current to flow much easier than an insulator does
The difference between conductors and insulators depends on how they are used
None of these
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

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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 force of attraction between the poles of a permanent and temporary magnetic field
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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