Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

None of these
Like magnetic poles repel; unlike poles attract
Like magnetic poles attract; unlike poles repel
Current is induced in a conductor that is moving through a magnetic field
Current flowing through a conductor generates a magnetic field

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Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a negative charge and a proton has a positive charge
None of these
An electron has a positive charge and a proton has a negative charge
An electron has a negative charge and a proton has no charge
An electron has a positive charge and a proton has no charge

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

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
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

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