Electronic Principles
Which one of the following phrasers best describes flux density?

The opposition to a build-up of magnetic fields
The rate of change of the number of lines of magnetic force
None of these
The concentration of lines of magnetic force
The force that maintains lines of force

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Electronic Principles
What is a negative ion?

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

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