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

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

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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
The circular magnetic field that surrounds a conductor carrying a current
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

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