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

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

an increase in current through the coil causes no further increase in the mmf
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
the core is permitted to move freely within the coil
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

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