Electronic Principles
Doubling the diameter of the coil in an inductor:

multiplies the value of inductance by two
None of these
reduces the value of inductance by one-half
reduces the value of inductance by one-fourth
multiplies the value of inductance by four

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

The amount of magnetic flux that is not confined to the core material of an electromagnet
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
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off

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