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

None of these
solar cell
nicad cell
piezoelectric device
photodiode

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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
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
the core is permitted to move freely within the coil
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these

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