Electronic Principles
Current is

The flow of charged particles through a material
The force that causes electrons to flow
None of these
An imbalance of electrical charges
The number of free electrons in an atom

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

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

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