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

None of these
frequent changes in the direction of current through the coil causes heating effects in the core material
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

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The force of attraction between the poles of a permanent and temporary magnetic field
None of these
The circular magnetic field that surrounds a conductor carrying a current
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The amount of magnetic flux that is not confined to the core material of an electromagnet

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Electronic Principles
Which one of the following statements applies to common auto batteries?

Auto batteries are secondary wet-cell batteries
Auto batteries are secondary dry-cell batteries
None of these
Auto batteries are primary dry-cell batteries
Auto batteries are primary wet-cell batteries

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Electronic Principles
Which one of the following statements best applies to a series RLC circuit?

The current waveform for each component always has the same amplitude and phase as the applied current
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
The sum of the current is always less than the applied current
None of these
All of these

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