Electronic Principles
A device that converts chemical energy to electrical energy is called a:

None of these
electric device
solar cell
chemical cell
thermocouple

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

None of these
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
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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