Electronic Principles
What kind of battery is most likely included in a cordless electric knife?

Nicad battery
Mercury-cell battery
Lead-acid battery
Zinc-carbon battery
None of these

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

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

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