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 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
None of these

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Electronic Principles
What is a free electron?

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

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Electronic Principles
Molecule is

A atom that has a shortage of electrons in its outer orbit
A atom that flows whenever there is an imbalance of electrical charges between two points
None of these
The smallest particle of a substance that retains the properties of that substance
A atom that has an excessive number of electrons in its outer orbit

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Electronic Principles
What is the primary difference between primary and secondary cell batteries?

Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
None of these
Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries

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