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
None of these
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
The amount of magnetic flux that is not confined to the core material of an electromagnet

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Electronic Principles
What is a negative ion?

An atom that contains more protons than neutrons
None of these
An atom that contains more protons than electrons
An atom that contains more electrons than neutrons
An atom that contains more electrons than protons

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